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SLI / CrossFire FAQs

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a b Î Nvidia
a c 169 U Graphics card
October 13, 2007 11:29:33 AM

Hello everyone
I have seen many people making mistakes about MultiGPU technology or have difficulties understanding; therefore,I decided to write a guide that helps you understand it better.
So,let's start!

What is SLI ?
NVIDIA SLI is a platform that allows you to scale graphics performance by combining multiple NVIDIA graphics solutions in a single system.

What is Nvidia Hybrid SLI?
From Hothardware.com :
NVIDIA's Hybrid SLI technology gives users the ability to pair an IGP, or mGPU (motherboard GPU), with a discreet graphics card, or cards, for two new modes of operation. NVIDIA calls these new modes Hybrid Power and GeForce Boost.
GeForce Boost does what its name suggests. By coupling the motherboard's integrated GPU with a discreet graphics card, the 3D rendering workload is shared between the two GPUs for a boost in performance. Currently, GeForce Boost is only supported by GeForce 8400 GS and 8500 GT discreet cards, as for the IGP, only the next-gen nForce 700a series of chipsets due to arrive this quarter will be supported initially.

What is CrossFire ?
CrossFire is a high-performance PC Gaming Platform technology that enables multiple ATI Radeon graphics cards and a CrossFire-ready motherboard in a single computer to increase graphics quality and performance.

What is CrossFireX(Quad CrossFire)?
From Techreport.com:
CrossFireX is, quite simply, an extension of the CrossFire dual-GPU feature to three and four GPUs.
Here's the chart from AMD's website regarding which cards can you use in crossfire,motherboard support and more.


What is AMD Hybrid CrossFire?
Hybrid CrossFire allows integrated graphics and low-end discrete graphics to be used in CrossFire mode.

Overall,both Hybrid CrossFire and Hybrid SLI are mainly for power savings and aren't a good solution for gaming and 3D performance(overall).


Can you use SLI on a CrossFire board or CrossFire on a SLI board ?
Well , in general , the answer is NO;however,there are some methods(like driver hacks) that allows you to do this.
Caution:There is no guarantee that this driver hacks work,so do it at your own risk!

With the release of Core "i" CPUs,Intel announced chipsets(P55,X58,Z68,etc.) that allow users to use CrossFire and SLI on the same motherbard.(However,still some of them only support either SLI or CrossFire)
But the newer chipsets like Z77,X79 etc. usually support both SLI and CrossFire.And it's safe the say the future models will be the same;supporting both SLI and CrossFire.


Do the cards have to be same model?
For "Most" Nvidia cards the answer is yes,but there are some exceptions too,such as pairing a GTS 250 with a 9800GTX+,which can only be done if both cards have the same amount of memory. (It's possible because GTS 250 is actually a re-badged 9800GTX+)
But again there are some cards like 9800GT and 8800GT which have the same specifications but in general you can't pair them in SLI.(Some users have reported that by flashing a 8800GT's BIOS to a 9800GT's BIOS,you can do it,but its risky and not recommended.)

But for AMD/ATI cards,It's different.
For older models like X1900 cards,you have to use the same/master card in order to run them in CrossFire mode.
But for HD 2xxx cards and up,there are no master cards so you simply can use 2(or more) (same)cards in Crossfire.

So the general answer is yes,with some exceptions.So it's recommended to use the same cards for best results.

You can find more information regarding matching cards in SLI/Crossfire at the end of this guide.

What about the memory? Can you use 7800GTX 256MB with it's 512MB version ?
For Nvidia cards,the general answer is no.
http://www.slizone.com/object/slizone_ask_mmm013.html
"Another misconception is that the GeForce 7800 GTX (256MB) graphics cards and the GeForce 78000 GTX 512 graphics cards can be paired together. Since these graphics cards use different GPUs, they unfortunately CAN'T be paired together. Always refer the Learn More or Build sections of SLIZone."
So,you generally can't pair a 7800GTX 256 with 7800GTX 512 or GTX 460 768MB with its 1GB version unless you use some 3rd party applications(which isn't recommended).
However,if you manage to run these cards in SLI,then the model,with higher amount of RAM,will reduce it's RAM to match the other card.

For ATI cards,it's different.
As an example,you can Crossfire HD 5870 2GB with it's 1GB version (but again the 2GB version lowers it's memory to 1GB)

So,generally,,it's recommended to use 2(or more than 2) identical cards with the same amount of memory.

What about brands ?
Brands don't matter,as long as they're the same card with the same memory/speeds.

What happens if the cards have different speed
For ATI cards;
One of the cards will raise/lower its clock speeds to reach the other card's speeds.
For Nvidia cards;
Well it "was" like ATI with older drivers, but with new drivers its quite different.If you use 2(or more) Nvidia cards with different clock speeds in SLI mode,none of them will change their clocks and they will perform at their default clock speed.

Again,that's why I usually recommend using the same cards in multiGPU modes.

A Very important note about bridges
It's been frequently asked whether to use 1 or 2 SLI/Crossfire bridges.
The answer is that it will work with 1 bridge without any problems but I recommend using both bridges because:
1_You will never lose either of these bridges.
2_Some users have reported a minimal(not noticeable) performance increase.

Do SLI or CrossFire always improve performance ?
Not always.
There are some games that don't benefit from either SLI or CrossFire or require a patch in order to fully utilize both cards.
For example,Flight simulator X doesn't benefit from either SLI or CrossFire;on the other hand,BattleField 4 benefits from this technologies.It depends on the game to be honest.
This link has some great comparisons between single and multiGPU configurations in numerous games
http://www.tomshardware.com/reviews/crossfire-sli-scali...


What are SLI and CrossFire certified Motherboards?
SLI certified motherboards:
http://www.slizone.com/object/slizone_build_mobo.html
CrossFire certified Motherboards:
http://ati.amd.com/technology/crossfire/buildyourown1.h...

Is the memory important??
No,your computer's RAM isn't at all related to the cards you are using,just make sure it's compatible with the motherboard and CPU.

What are the power requirements for SLI or CrossFire ?
For every configuration,the power requirement is different.
Nvidia cards:
http://www.slizone.com/object/slizone_build_psu.html
AMD/ATI cards:
http://sites.amd.com/us/game/products/certified/Pages/c...

There are some compatible models that aren't listed so always check with the manufacturers website at first.

Is it really necessary to use SLI or CrossFire ?
It all comes down to 2 factors:
1)The games that you play
2)The resolutions that you play at
As mentioned,there are some games that don't benefit from either SLI or Crossfire;also both SLI/Crossfire really shine when you play "at least on" 1080p,even on this resolution,a single powerful card can handle everything fine.

Is it better to get 2 mid-range cards or 1 high-end card?
It really depends on you.I "personally" prefer a single high-end card rather than 2 mid-range cards because usually,the single card produces less heat and has less power consumption but it may cost more too.
So it all comes down to personal preference and budget.

Do SLI or CrossFire double the memory ?
No.Adding another card with more memory doesn't double the overall memory of your cards.

Which is better , SLI or CrossFire ?
It again comes to personal preference and the games that you play.
There are some specific games that scale better under SLI and vice-versa.

A note about Motherboards
For 2-way SLI,motherboards either support CrossFire at dual x16,dual x8 or x16x4 speeds.
The first will give you the best performance.
Dual x8 is also good and performs on par with dual x16 in most games.
But x16x4 is kinda different.
On PCI-E 1.0 boards/cards,there is a huge difference between x16x4 and dual x16(and 8x).
On PCI-E 2.0/3,0 boards/cards;however,the performance gap isn't as high.(The performance is notable in some games though,especially on high resolutions)
Generally, recommend dual x16 or dual x8 for MultiGPU setups.

Here is a good article which compares CrossFire performance between dual x16,dual x8 and x16x4
http://www.tomshardware.com/reviews/crossfire-pci-expre...


List of NVIDIA and AMD/ATI MultiGPU compatible Graphic Cards: (All of them are PCI-EXPRESS cards,AGP cards don't support any kind of multiGPU setups)

NVIDIA cards(Desktop models)

Geforce TITAN Family:
NVIDIA GEFORCE GTX TITAN BLACK
NVIDIA GEFORCE GTX TITAN

Geforce GTX 700 Family:
NVIDIA GEFORCE GTX 780Ti
NVIDIA GEFORCE GTX 780
NVIDIA GEFORCE GTX 770
NVIDIA GEFORCE GTX 760
NVIDIA GEFORCE GTX 750Ti
NVIDIA GEFORCE GTX 750


Geforce GTX 600 Family:
NVIDIA GEFORCE GTX 680

Geforce GTX 500 Family:
NVIDIA GEFORCE GTX 590(1 PCB*)
NVIDIA GEFORCE GTX 580
NVIDIA GEFORCE GTX 570
NVIDIA GEFORCE GTX 560Ti
NVIDIA GEFORCE GTX 560
NVIDIA GEFORCE GTX 550Ti
NVIDIA GEFORCE GT 520

Geforce 400 Family:
NVIDIA GEFORCE GTX 480
NVIDIA GEFORCE GTX 470
NVIDIA GEFORCE GTX 465
NVIDIA GEFORCE GTX 460
NVIDIA GEFORCE GTS 450
NVIDIA GEFORCE GT 440
NVIDIA GEFORCE GT 430

Geforce 200 Family:
NVIDIA GEFORCE GTX 295
NVIDIA GEFORCE GTX 285
NVIDIA GEFORCE GTX 280
NVIDIA GEFORCE GTX 275
NVIDIA GEFORCE GTX 260 Core 216(You can pair it with the Core 192 version.)
NVIDIA GEFORCE GTX 260 Core 192
NVIDIA GEFORCE GTX 250(You can pair it with 9800GTX+ in SLI configuration,however make sure that both cards have the same amount of memory)

Geforce 9 Family:
NVIDIA GEFORCE 9800GX2 (2 PCB's)
NVIDIA GEFORCE 9800GTX+(You can pair it with a Nvidia 9800GTX in SLI configuration,but it's recommended to use the 9800GTX+ card in the first PCI-E 16x slot.)
NVIDIA GEFORCE 9800GTX
NVIDIA GEFORCE 9800GT
NVIDIA GEFORCE 9600GT
NVIDIA GEFORCE 9600GSO
NVIDIA GEFORCE 9500GT
NVIDIA GEFORCE 9400GT

Geforce 8 Family:
NVIDIA GEFORCE 8800ULTRA
NVIDIA GEFORCE 8800GTX
NVIDIA GEFORCE 8800GTS 512
NVIDIA GEFORCE 8800GT
NVIDIA GEFORCE 8800GTS 640
NVIDIA GEFORCE 8800GTS 320
NVIDIA GEFORCE 8800GS
NVIDIA GEFORCE 8600GTS
NVIDIA GEFORCE 8600GT
NVIDIA GEFORCE 8500GT
NVIDIA GEFORCE 8400GS

Geforce 7 Family:
NVIDIA GEFORCE 7950GX2 (2 PCB's)
NVIDIA GEFORCE 7900GTX
NVIDIA GEFORCE 7950GT
NVIDIA GEFORCE 7900GT
NVIDIA GEFORCE 7900GS
NVIDIA GEFORCE 7800GTX 512
NVIDIA GEFORCE 7800GTX 256
NVIDIA GEFORCE 7800GT
NVIDIA GEFORCE 7600GT
NVIDIA GEFORCE 7600GS
NVIDIA GEFORCE 7300GT
NVIDIA GEFORCE 7300GS
NVIDIA GEFORCE 7300LE

Geforce 6 Family:
NVIDIA GEFORCE 6800ULTRA
NVIDIA GEFORCE 6800GT
NVIDIA GEFORCE 6800GS
NVIDIA GEFORCE 6800
NVIDIA GEFORCE 6800LE
NVIDIA GEFORCE 6600GT
NVIDIA GEFORCE 6600
NVIDIA GEFORCE 6600LE



NVIDIA cards(Notebook models)

Geforce 800M Family:
NVIDIA GEFORCE GTX 880M
NVIDIA GEFORCE GTX 870M
NVIDIA GEFORCE GTX 860M

Geforce 700M Family:
NVIDIA GEFORCE GTX 780M
NVIDIA GEFORCE GTX 770M
NVIDIA GEFORCE GTX 765M
NVIDIA GEFORCE GTX 760M
NVIDIA GEFORCE GTX 750M

Geforce 500M Family:
NVIDIA GEFORCE GTX 580M
NVIDIA GEFORCE GTX 570M
NVIDIA GEFORCE GTX 560M


Geforce 400M Family:
NVIDIA GEFORCE GTX 485M
NVIDIA GEFORCE GTX 480M
NVIDIA GEFORCE GTX 470M
NVIDIA GEFORCE GTX 460M



Geforce 200M Family:
NVIDIA GEFORCE GTX 280M
NVIDIA GEFORCE GTX 260M

Geforce 100M series:
NVIDIA GEFORCE GTS 160M
NVIDIA GEFORCE GTS 150M
NVIDIA GEFORCE GTS 130M

Geforce 9 Family:
NVIDIA GEFORCE 9800MGTX
NVIDIA GEFORCE 9800MGT
NVIDIA GEFORCE 9800MGTS

Geforce 8 Family:
NVIDIA GEFORCE 8800MGTX
NVIDIA GEFORCE 8700MGT
NVIDIA GEFORCE 8600MGT

Geforce 7 Family:
NVIDIA GEFORCE 7950GTX
NVIDIA GEFORCE 7900GTX
NVIDIA GEFORCE 7800GTX


AMD cards(Desktop models)

AMD Radeon R9 Family:
AMD R9 290X
AMD R9 290
AMD R9 280X
AMD R9 280
AMD R9 270X
AMD R9 270

AMD Radeon R7 Family:
AMD R7 265
AMD R7 260X
AMD R7 260
AMD R7 250X
AMD R7 250
AMD R7 240

AMD HD 7xxx Family:
AMD HD 7970
AMDI HD 7950
AMD HD 7870
AMD HD 7850
AMD HD 7770
AMD HD 7750


AMD HD 6xxx Family:
AMD HD 6990(1 PCB)
AMD HD 6970
AMD HD 6950
AMD HD 6870
AMD HD 6850
AMD HD 6670
AMD HD 6570

AMD HD 5xxx Family:
AMD HD 5970
AMD HD 5870 Eyefinity 6 edition(Can be used in CrossFire with the non-Eyefinity 6 version)
AMD HD 5870
AMD HD 5850
AMD HD 5830
AMD HD 5770
AMD HD 5750
AMD HD 5670
AMD HD 5570
AMD HD 5550
AMD HD 5450

AMD HD 4xxx Family:
AMD HD 4890
AMD HD 4870X2(1 PCB)
AMD HD 4870
AMD HD 4850
AMD HD 4830
AMD HD 4770
AMD HD 4750
AMD HD 4670
AMD HD 4650
AMD HD 4550
AMD HD 4350

AMDHD 3xxx Family:
AMD HD 3870X2(Read the extra information about HD 5970,its the same for HD 3870X2)
AMD HD3870
AMD HD 3850
AMD HD 3830
AMD HD 3650
AMD HD 3470
AMD HD 3450

AMD HD 2xxx Family:
AMD HD 2900XT
AMD HD 2900PRO
AMD HD 2900GT
AMD HD 2600XT
AMD HD 2600 PRO
AMD HD 2400XT
AMD HD 2400 PRO

AMD X19xx Family:
AMD X1950XTX
AMD X1950PRO
AMD X1900XTX
AMD X1900XT
AMD X1900GT(Unlike X1900XT and 1900XTX which require a Master card to run in CrossFire,this card can be paired with another X1900GT card)

AMD X1xxx Family:
AMD X1800XT
AMD X1800GTO
AMD X1800XL
AMD X1650 PRO
AMD X1650XT
AMD X1600XT
AMD X1600PRO
AMD X1550
AMD X1300XT
AMD X1300PRO
AMD X1300

AMD X850 Family:
AMD X850XT-PE
AMD X850XT
AMD X850 PRO



AMD Cards(Notebook models)


AMD HD 6xxx Family:
AMD HD 6970M

AMD HD 5xx Family:
AMD HD 5870M

AMD HD 4xxx Family:
AMD HD 4870M

AMD HD 3xxx Family:
AMD HD 3870M


* PCB stands for Printed Circuit Board, its the hard "plastic-like" colored part in a graphics card/motherboard.


So,I hope reading this guide helps you understand MultiGPU technology better.I've kept this topic opened so that you can ask your questions and post your suggestions about the it.
Special thanks to emp,4745454b,alias_the_​jester and MouseMonkey and NukeMaster for helping making this guide.

More about : sli crossfire faqs

October 13, 2007 2:06:38 PM

thanks, that was informative.
October 13, 2007 3:37:55 PM

Nothing I didn't already know, but regardless of that it is indeed VERY helpful for people who are confused on the subject. I suggest it get stickied but with a title change... like "READ THIS before asking any questions about MultiGPU technology" or similar.

Also you should add that it is usually not worth it getting dual cards over a single higher end one and the reasons behind it, but still very good job.
Related resources
Can't find your answer ? Ask !
a b Î Nvidia
a c 169 U Graphics card
October 13, 2007 4:36:44 PM

thanx EMP ,well unfortunately i can only Do QUICK EDIT , when i go to EDIT THIS MESSAGE , it says u are not allowed to edit this message, so i cant change the TOPIC name , but i edited the message , thanx to u

P.S , i know many know about SLI or CrossFire , but because i have seen people making mistake or they have some questions , i decided to make this

thx again
October 13, 2007 4:52:49 PM

Thanks Maizar, I've seen countless posts about SLI and CF where the posters clearly didn't know the basics, hopefully this will cut down on a lot of misinformed posting.

Then again ignorance is caused by a lack of reading useful information, so lets hope this gets sticky status so that people will read it.

hmmm, another thought, put "teen porn" as the subject and i guarantee the number of hits for this guide will increase dramatically.

People are so predictable.

for further useful hints and tips click here
a b Î Nvidia
a c 169 U Graphics card
October 13, 2007 5:23:25 PM

who must i tell to make this thread stickie ?
a b Î Nvidia
a c 130 U Graphics card
October 13, 2007 5:34:12 PM

To stranger stranger,While i agree with you in princaple.
Main problem with that is although it is a good idea in theory its mainly new people to the forum who ask these questions/so dont know about stickys.Also it would help if the search feature actually worked instead of saying every topic searched(even ones i posted as a test) were no longer found.

To Go Oman
Being Ignorant of the facts and being Ignorant are two differant things and alot of the time being misinformed is confused as being the same thing i have seen people argue untill they were blue in the face (hard to gague on a forum i know but get the point i think).But totally beleive that what they thought they knew was true.
The internet is a gold mine of info but it takes a while for the cream to rise to the top.
I have done it myself and will probably do it again,when a source proves time and time to be reliable then we will defend it up to a point,its just some people cant see that point.
Mactronix :) 
October 13, 2007 6:35:38 PM

How did they get the BlackBird from HP to run xfire on a striker extreme board??
October 13, 2007 6:51:59 PM

Very informative thank you.
I have two 8800GTS 320 SC in SLI and they work great.
a b U Graphics card
October 13, 2007 6:52:02 PM

Also, you should add in that while it can increase the maximum FPS, it will bring up your minimum FPS, as well, which results in MUCH better gameplay than ANY increase in max. frames (unless the max is under 30 or so.)
October 13, 2007 6:57:52 PM

Nice. I hoped to see more, though. Especially about CF - i.e. things like "hardware" and "software" Crossfire, pairing different ATI cards in CF...

Thanks for your efforts
a b Î Nvidia
a c 169 U Graphics card
October 13, 2007 7:01:00 PM

i have talked about pairing NVIDIA cards , for CorssFire its the same

to flip_x, its said if u update the graphic card driver, it will be done

October 13, 2007 7:08:05 PM

flip_x said:
How did they get the BlackBird from HP to run xfire on a striker extreme board??


Having been on an Air Force base that had SR-71 Blackbirds, if I tried to tell you, I'd get arrested and you might end up in the next cell.

As far as running Crossfire on a Striker mobo, that involves installing hacks that may or may not work on a given combination of parts, and waiting for drivers that neither Nvidia nor ATI will ever provide.
a b Î Nvidia
a c 169 U Graphics card
October 13, 2007 7:40:49 PM

how can i tell a moderator to make this stickie ? PM him ?
a b Î Nvidia
a c 130 U Graphics card
October 13, 2007 7:44:41 PM

I sugest that you ASK a moderator who to contact via PM. :) 
Mactronix
Go to the main forum screen scroll down to graphics and at the end you will fing a list of mods
October 13, 2007 8:04:36 PM

emp said:
...
Also you should add that it is usually not worth it getting dual cards over a single higher end one and the reasons behind it, but still very good job.


May I suggest that instead of just saying that "it is usually not worth it", why not point out when it is worth it is worth it and when it is not worth it.

SLI is worth it for me, because I need 2 cards to run 3 monitors, but if I want to run games SLI will let me run them better because of the high resolutions.

Another example is, you got a card that no longer keeps up with the applications you want, and you can get another (maybe used) for cheap on eBay or craiglist.

Anyone selling their GTX cheap? I hear there are much better cards with 3TFlops on the way . I will be happy to take that crappy old GTX off your hands for lets say $200? :kaola: 
a b Î Nvidia
a c 130 U Graphics card
October 13, 2007 8:52:12 PM

To SpeedyVV
I think you are being a bit harsh here emp is only sugesting an improvement to this sticky in the making, Im sure that if it does make sticky status that the good people at toms will give it the once over and word it correctly to include this and any other addition that is worthy of a mention.
Mactronix
October 13, 2007 9:24:21 PM

mactronix said:
To SpeedyVV
I think you are being a bit harsh here emp is only sugesting an improvement to this sticky in the making, Im sure that if it does make sticky status that the good people at toms will give it the once over and word it correctly to include this and any other addition that is worthy of a mention.
Mactronix


Mactronix, sorry if it came across harsh. Definately not my intention, that is why I said "may i suggest" a futher improvement.

Also I do agree with emp's point, that in most cases it is not worth it.

My point is, a lot of n00bs like myself, and hence my suggestion, will want to know when and why it is worth or not worth doing SLI\Crossfire.

I hope they do make it a sticky. it is a very good article.

PS: To the OP, might want to give a heads up to Quad\Tri\Hybrib SLI. I am not sure how reliable the info available is at this point, but did see some posts on them.
a b Î Nvidia
a c 130 U Graphics card
October 13, 2007 9:44:34 PM

Oh no its not that you caused any offence or anything this kind of thing is usually an ongoing ebb and flow kind of thing with everybody making suggestions and input EMP made a suggestion for an improvement and you made a suggestion of how to implement it. From past posts etc im quite sure EMP understands the why's and whatfores etc.
Your point was definitely constructive and another person may have read my post and thought i was out of order for mentioning it.
As you say there are people out there who generally know its not always a good idea but dont really know why.


I'm glad that you took my post the way it was intended and look forward to thrashing out other issues with you in the future :) 
October 14, 2007 12:27:23 AM

Good post. I do not have the money for SLI (or a new anything really) but it was very informative. There were several items that I did not know about(such as the memory not doubling).
October 14, 2007 12:55:12 AM

You need to include information on MB/Chipsets, since that is a major part of SLI vs Crossfire

A number of people have been expressing their thoughts on how good the X38 will be for SLI, yet Nvidia are not supporting the chipset. This is something a noob needs to be made aware of...

My $0.02 AUD ($0.018 USD :)  )
a b Î Nvidia
a c 169 U Graphics card
October 14, 2007 1:13:40 PM

i wanted to add information about MB/chipset but i didnt because , i have to talk about the performance difference of 16x16x, 16x4x, 8x8x and thats mostly related to the motherboard section

thx to all for reading this topic, i will PM a moderator now
a b Î Nvidia
a c 169 U Graphics card
October 14, 2007 6:02:33 PM

Edited
October 14, 2007 6:50:55 PM

Sticky!!!

Very good job!
a b Î Nvidia
a c 169 U Graphics card
October 14, 2007 7:05:47 PM

thanx to all who have read this and i hope its useful
also thanx to the moderators
a b Î Nvidia
a b U Graphics card
October 15, 2007 7:24:18 PM

There a few things that need to be cleaned up in the description if it's to remain a sticky.

You need to change the wording of the description of Xfire, you make it sound like ATi copied nV when if anything it's nV who copied ATi and Metabyte's methods of doing multi-card graphics. nV's SLi bears no resemblance to 3Dfx's SLI in anything other than name. And SLi didn't come first in the rebirth, that was Alienware's failed ALX and XGI's volari V8 Duo. And ATi was doing their SIMFusion thing the whole time with Evans & Sutherland.

Also you need to split the solutions up, since your first example of the same cards applies to SLi but not Xfire. So it should be clearly defined which one you're talking about, you examples lets someone guess, but it needs to be explicit.
And in the memory example following it, you talk about memory and then talk about speeds. The 7800GTX is a bad example for memroy since there is athat large difference. But when mentioning memory and talking about size you should mention the size being affected and that they will disable the added memory. You're sort of mixing your ideas here. Then right after that you say you can mix/mathc brands but make sure they have the same memroy and clocks, yet right before that you imply/state they can have different memory/clocks.
For an Xfire section you should add that while the cards need to be the same underlying architecture, they can have different numbers of shaders or pipelines and still work together, like an X1900GT + X1900CF combination.

Also when talking about multi GPU benefits, rememebr to mention that one of the areas of greatest impact is also in the minimum fps, where it will usually increase min fps and smooth out dips into the lower numbers. It's an important factor that's usually missed in the discussion and is the area that would be most noticeable to people not looking simply to push large resolutions or high settings.

And when talking about does it always improve performance, you should also mention that sometimes it actually hurts performance when using the additional card.

When talking about the memory doubling myth you may wish to expand on how the memory is used and why it doesn't 'double the memory' when in Crossfire/SLi mode.

When talking about 2 midrange beating 1 high end, the thing to rememebr is that there are exception to that, like 2 GF7800GTs beating 1 GF7800GTX-512 for less money, or 2 GF8800GTS beating a single GTX or Ultra for the same money, but it depends on the situation, because there's no clear cut rule for that.

I'd get rid of the 'which is better' comment, you could discuss that with intelligent people night and day and never get and answer, and posting to any one benchmark doesn't solve that question either. So I'd pretty much avoid it unless you take the time to explore it further than a link to a single group of tests.

Also I'd avoid posting a list of cards, unless you can keep it up to date and include all the sub cards, better to just link to AMD & nV's list thus the onus is on them and not you.

BTW, what the Crossfire/SLi RAMs sections? Sounds like you're talking about the 'certified' parts. But the way its written sounds like VRAM.

If you're mentioning 'Crossfire/SLi editions' etc. you might want to mention that for AMD the boxes stamped 'Crossfire Edition' come with the ribbon connectors required to run cards in Xfire.

There's also a few spelling mistakes, but I can clean those up directly if you want.
a b Î Nvidia
a c 169 U Graphics card
October 16, 2007 10:23:45 AM

thanx for your suggestion , i really wanted to write something which isnt very hard to understand and is useful , but i am always opened to suggestions

Edited(BTW i will make uo my spelling mistakes too )
October 19, 2007 11:11:31 PM

TheGreatGrapeApe said:

When talking about 2 midrange beating 1 high end, the thing to rememebr is that there are exception to that, like 2 GF7800GTs beating 1 GF7800GTX-512 for less money, or 2 GF8800GTS beating a single GTX or Ultra for the same money, but it depends on the situation, because there's no clear cut rule for that.



When I referred to midrange SLI vs single high end we refer to 7600GT SLI vs 7800GT(X), not 7800GT SLI vs 7800GTX. At least to me there is High end (Includes, but is not only top of the line), midrange, and low end/mainstream. To me the high end of a graphics card line would be for example ALL 6800 based cards of the Geforce 6 Series (Includes Vanilla, GT, Ultra, GS...), the midrange would be the 6600 series on all it's flavors (Vanilla, GT...), and the low end are 6200 cards, now this can all vary depending on how severely crippled a card is compared to the rest like midrange labeled car dangerously close to being a low end, as far as I know those might be isolated incidents like the 6600LE.

My point is, even if you get SLI 8800GTS over a single GTX you will most likely get better performance on some/most titles but it will not always be the case, however getting 8600GT on SLI to do the job of a 8800GTS will not get you anywhere near close the performance of the aforementioned. (Which is what I was referring on my first post)
a b Î Nvidia
a b U Graphics card
October 19, 2007 11:35:01 PM

Well the way I look at it is value/performance. My reply wasn't to what you said, just to the concept in general as the OP put it.

Regardless of what we give the 'label' mid-range, I'm talking about 2 cards at less than 1/2 the price. sometimes that's a GF7600/X1600, sometimes that's a GF7800GT/X1950Pro.

I think it matters less about the class than the concept, and that's where I think most people look anyways.
October 21, 2007 8:16:20 AM

about that two mid range cards vs high end card.

if i get to mid range cards work in crossfire, will it give me higher "min" FPS at resolutions 1600x1200 (maybe slightly higher, maybe lower). with high graphics settings?

why im asking, coz ill be buy 2600xt (which is good for budget). n i cant get 8800GTS, nor the new 8800GT (since it will be $200+). n probably in two/three month ill get another 2600xt.
a b Î Nvidia
a c 169 U Graphics card
October 21, 2007 12:02:46 PM

2 midrange cards like 2 2600xt MAY beat a single 8800gts in lower resolutions (under 1600x1200) in some games, but in higher resolutions a single 8800gts beats 2 2600xt (it means a single high-end card will beat 2 midrange cards in most cases , but the difference shines in high resolutions)
October 21, 2007 12:57:14 PM

Maziar said:
2 midrange cards like 2 2600xt MAY beat a single 8800gts in lower resolutions (under 1600x1200) in some games, but in higher resolutions a single 8800gts beats 2 2600xt (it means a single high-end card will beat 2 midrange cards in most cases , but the difference shines in high resolutions)


u got me confused there. lol. ill tell u what i understood.

1-two mid range can beat (or may beat) the 8800gts in lower resolution. in higher resolutoin the 8800gts will preveal.
2- but in high resolutions the two mid range will shine
October 21, 2007 6:17:45 PM

TheGreatGrapeApe said:
Well the way I look at it is value/performance. My reply wasn't to what you said, just to the concept in general as the OP put it.

Regardless of what we give the 'label' mid-range, I'm talking about 2 cards at less than 1/2 the price. sometimes that's a GF7600/X1600, sometimes that's a GF7800GT/X1950Pro.

I think it matters less about the class than the concept, and that's where I think most people look anyways.



Lets take two 320 meg OC 8800gts cards in SLI (600$)
are they better than one 8800 gtx or ultra (at a higher price! - between 600 and 700$)
Actually I want to choose one or the other as I'm rigging a new box.
Iron Nads
October 21, 2007 6:23:09 PM

Depending on the resolution and amount of AA the GTX might trump the two cards, because even though you have a lot of horsepower packing on those two cards you only have 320MB of VRam to play with, and that's not a lot.

On top of that you have A LOT more heat and power issues using SLI GTS OC over a single GTX, which in my eyes is not worth the hassle for maybe 5-10 fps more at lower resolutions.
a b Î Nvidia
a c 169 U Graphics card
October 21, 2007 7:22:25 PM

night_wolf_in said:
u got me confused there. lol. ill tell u what i understood.

1-two mid range can beat (or may beat) the 8800gts in lower resolution. in higher resolutoin the 8800gts will preveal.
2- but in high resolutions the two mid range will shine



i meant 2 midrange cards like 2600xt MAY beat a single 8800GTS in some games in low resolutions, but in higher resolutions , 2 2600xt dont stand a chance against a 8800GTS
a b Î Nvidia
a c 169 U Graphics card
October 21, 2007 7:24:07 PM

emp said:
Depending on the resolution and amount of AA the GTX might trump the two cards, because even though you have a lot of horsepower packing on those two cards you only have 320MB of VRam to play with, and that's not a lot.

On top of that you have A LOT more heat and power issues using SLI GTS OC over a single GTX, which in my eyes is not worth the hassle for maybe 5-10 fps more at lower resolutions.



exactly
thanx for helping me in this topic Emp :)  ( u always have helped me :)  )
October 21, 2007 11:30:15 PM

NP :D  By the way, have you tried Unreal Tournament 3 demo on that GTX of yours? Game looks awesome even at the max settings of the demo (Which I believe are not the max settings of the final game).
October 22, 2007 3:22:31 AM

I just wanted to say thanks for posting this, it just helped me decide which card to purchase :) 
a b Î Nvidia
a c 169 U Graphics card
October 22, 2007 8:57:37 AM

emp said:
NP :D  By the way, have you tried Unreal Tournament 3 demo on that GTX of yours? Game looks awesome even at the max settings of the demo (Which I believe are not the max settings of the final game).



No unfortunately not , because when the download completed and when i clicked on it, it said Faild To initialize , and also because my Download speed is poor (16KB/S) it will take time to Download it again
a b Î Nvidia
a c 169 U Graphics card
October 22, 2007 9:00:27 AM

To Zordana
I am glad that it helped u

a b Î Nvidia
a b U Graphics card
October 22, 2007 3:55:30 PM

Ironnads said:
Lets take two 320 meg OC 8800gts cards in SLI (600$)
are they better than one 8800 gtx or ultra (at a higher price! - between 600 and 700$)
Actually I want to choose one or the other as I'm rigging a new box.


Depends on the game and the settings. The problem with that example is that the GTS is both memory bandwidth and size limited, and so if you're playing a high-texture dependant game you're likely not oing to see anywhere near the performance, even if you do get an SLi boost. Which is the other issue some games don't get that boost.

however if there is a noticeable SLi boost inthe game you pick, and it is not memory limited, there's a good chance it will be competative for the price.

I still don't like a 2 card SLi solution versus a single card in general, but there are some cases where it makes sense, and in general those two cards usually keep their value better, as long as it's not 2 new cards against 1 older card, but 2 relatively similar generation card usually hold up better for selling as well.
a b Î Nvidia
a b U Graphics card
October 22, 2007 4:48:20 PM

emp said:

On top of that you have A LOT more heat and power issues using SLI GTS OC over a single GTX, which in my eyes is not worth the hassle for maybe 5-10 fps more at lower resolutions.


Power levels definitely more. Not sure about the heat though now that nVidia has a more exhaust style blower HSF. It might actually improve your heat situation with more air being sucked out (and hence in the front) of the PC. The limited input of radiation and conduction likely isn't enough to make that much of a difference over a single card. I've seen more than a few say that their temps went down after adding a second GF8 or HD2K card, which is surprising until you think of the airflow effect.

Quote:
Game looks awesome even at the max settings of the demo (Which I believe are not the max settings of the final game).


Yeah the demo is DX10, not sure about the texture quality though. I don't think it'd stress the GTS-320 beyond its limits in SLi, but who knows. Mark Rein talked alot about textures and DX10, so until the final edition comes it's hard to tell, and it could be a big shock for some people guaging their play on this demo.
I like it, but it's defintely less than they were promoting for looks. I don't care about the looks so much as if they have onslaught or not.
a b Î Nvidia
a c 169 U Graphics card
October 22, 2007 7:26:09 PM

thank u TheGreatGrapeApe :)  u have been a great help
October 27, 2007 2:03:30 AM

So then which would be better?

1.) 2 2900XT 512mb or 1GB in crossfire
or
2.) 1 8800XT or Ultra?

Aside from the extra noise and heat..

Good read Maziar! I am still trying to find a good overclocking MB, but the chipset choices are driving me bonkers in my decision making.
P35
X38
680I............................... :pt1cable: 
a b Î Nvidia
a c 169 U Graphics card
October 27, 2007 12:28:16 PM

2 2900xt beats single 8800ULTRA in almost every game, but there are some games _which as i said , dont take advantage of MultiGPU_ and in those games , a single 8800ULTRA may beat it
October 27, 2007 5:35:00 PM

Maziar said:
2 2900xt beats single 8800ULTRA in almost every game, but there are some games _which as i said , dont take advantage of MultiGPU_ and in those games , a single 8800ULTRA may beat it


Right, I understand the none multi gpu aspect. Isn't Multi GPU the way most games will go now?

Now are you saying that 2 2900XTs at 512 mb or the ones with 1gb of memory?

Also I wonder if there are any 20 to 24" LCD s with good enough refresh rates to really show off these cards at higher resolutions? Is it 6ms or less that you should be looking for?
a b Î Nvidia
a c 169 U Graphics card
October 28, 2007 3:17:50 PM

if you read my post , there are still some games which wont benefit from MultiGPU also there are some games that benefit from MultiGPU, but they dont have siginificant difference with single card configuration (Due to some driver problems )

also again i have said this, MultiGPU really shines in high resolutions like 1920x1200 and higher

About the 2900XT question, well 2900XT 512 doesnt have much difference with 2900XT 1GB (if u want benchmarks , PM me and i will send you some)
October 29, 2007 2:16:08 AM

Maziar said:
if u read my post , there are still some games which wont benefit from MultiGPU also there are some games that benefit from MultiGPU, but they dont have siginificant difference with single card configuration (Due to some driver problems )

also again i have said this, MultiGPU really shines in high resolutions like 1920x1200 and higher

About the 2900XT question, well 2900XT 512 doesnt have much difference with 2900XT 1GB (if u want benchmarks , PM me and i will send you some)



Yeah man I read your post.. :kaola: 
I was wondering about the memory difference. Like I read in one of your other post saying people need to remember that adding two cards together with 512 me doesnt mean you have 1gb of memory. So I wondered how 1gb would do compared to the 768mb Nvidia cards. Is it just overkill.
October 29, 2007 5:28:38 PM

Does the release of the 8800GT change anything on deciding between 2 8800GT's vs. a single 8800GTX?
October 29, 2007 11:37:57 PM

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