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SLI / CrossFire FAQs - Page 16

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Last response: in Graphics & Displays
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September 10, 2010 5:12:00 AM

Yeah I found the molex adapters but now it seems I need 4 of those old looking 4 pin connectors to get power to both 6 pin slots on the second card
September 11, 2010 4:27:39 AM

Well, get a converter at the local IT shop or at a circuiut city/best buy.
September 11, 2010 4:24:59 PM

Thanks man,

Done and it's all up and running thanks. Questions though. because the second card is running off the molex splitters and adapters, is it getting the same amount of power as the first card and ifso is it getting the same type of power???? I'm no electrician so to me 12 v rails and all that stuff is still a mystery... I'm researching it more but still.... I thought 12v rails only went to the pci-e connectors but now I'm using molex 4pin connections with adapters and splitters so now I'm REALLY confused.
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September 12, 2010 9:37:13 PM

What were the specs of the Molexa nd the adapter?
September 16, 2010 2:59:00 PM

Thanks Maziar your information has been really useful for me. I posted a question regarding this topic and would like to know your opinion. Thanks.
a b Î Nvidia
a c 169 U Graphics card
September 17, 2010 9:43:05 AM

I saw dogman answering your questions so i didn't post,so what exactly is your problem? it seems you have got your system up and running.
September 19, 2010 6:36:32 AM

the 7950 gx2 actually does need an sli board. i have this card and it wouldn't work on my non sli board. even though it only takes one slot the board has to know how to use it... i got this answer from asus when i called tech support cause my new (at the time) video card wouldn't work.
a b Î Nvidia
a c 169 U Graphics card
September 19, 2010 9:04:39 AM

No it requires one PCI-E slot.
http://en.wikipedia.org/wiki/GeForce_7_Series
"The 7950 GX2 requires only a single PCIe power connector, in contrast to the twin-connectors of its predecessor; technically, this is understandable, as there is no need for a ring bus configuration – frames need only be passed on to the primary GPU"
I don't know why it didn't work with your motherboard,but it requires only one PCI-E slot.
The ASUS support has probably mistaken it with 2 7950GX2s.
September 19, 2010 4:43:03 PM

Hello,

I have 2 sapphire 5770's, and would like to run 4 monitors instead of 2in ab asus m4a79xtd motherboard. I don't care about crossfire mode, but i do care about the 4 monitor setup. Is there some was I can disable crossfire mode in CCC, remove the bridge between the 2 cards, and achieve an extended video image across 4 monitors ?

Thanks,

Rex Winters
September 19, 2010 8:12:04 PM

I do believe you need Crossfire for this. What is your PSW wattage rating?

BTW, DO NOT openly post your email, someone could send you Malicious Software. That is what the Forum is for.

BTW,(again), Welcome to the Forums.
September 20, 2010 1:50:28 AM

Thanks for the quick reply

My power supply wattage is 700 watts

Rex Winters
a c 173 Î Nvidia
a c 274 U Graphics card
September 20, 2010 2:07:22 AM

Rex Winters said:
Thanks for the quick reply

My power supply wattage is 700 watts

Rex Winters

If you start your own thread rather than asking questions in a sticky you'll probably get a lot more responses.
September 27, 2010 7:21:12 AM

Hey, i want to get an graphic card and have core usage of Adobe Tools, which one will suit best for me?
a b Î Nvidia
a c 169 U Graphics card
September 27, 2010 9:52:39 AM

This thread is about SLI/CF, so please ask questions that are related to the topic.
Anyway, Adobe programs such as PS benefit more from CPU,so make sure you have a decent CPU along with sufficient amount of RAM.
All HD 5xxx series or Nvidia 2xx/4xx series are fine for PS.
October 1, 2010 1:00:20 PM

hi there

could you please tell me if a radeon hd 2900 xt and a 2900 pro run together on a asus p5q- premium.
i know one has a higher clock speed but the cards look the same.my computer is running a duo core at 3.4ghz with over 4gig of ram.and i do have the power to run two cards or even 4 cards.

please help steve.
a b Î Nvidia
a c 169 U Graphics card
October 1, 2010 6:43:17 PM

You have to flash the 2900 pro to 2900 xt and then you can use them in Crossfire mode.
October 2, 2010 1:31:19 PM

Maziar said:
You have to flash the 2900 pro to 2900 xt and then you can use them in Crossfire mode.


hi there
i know it sounds stupid but what do you mean by flash ,and how do you do this.
regards steve
October 2, 2010 1:38:00 PM

its me again
could you tell me if i have to have 2 crossfire bridges.
thanks again steve
a b U Graphics card
October 7, 2010 8:55:33 PM

Good Article
October 7, 2010 10:18:37 PM

I thought you would. I certainly do.
Anonymous
a b U Graphics card
October 13, 2010 5:39:12 AM

dude sli doubles your total vram that you have so technically it does double your memory.....
a b Î Nvidia
a c 169 U Graphics card
October 13, 2010 7:12:36 AM

No it doesn't.
"his is one the questions that many people make mistake understanding it .
The answer is NO , SLI or CrossFire doesnt double the memory , You have a 512MB card , adding another card wont make your memory 1GB, it still will be 512MB,so both cards will use 512MB of RAMs but the memory won't double.
Another example :
A game needs 512MB card to run at maximum settings , and you have a 256MB card , and you think if you add another 256MB card , your memory will be 512MB and thats not true."
If you still think its wrong,then please do a google search and read some trusted sites to be sure.
October 27, 2010 5:09:16 PM

THX this was very usefull

1 question though.... I have a gtx 460 gs 1 gb would it be pointless in buying another same 1 or should i buy the 768mb 1 since of what i understood wouldnt make a diffrence and save 20 euro?

thx in advance
a c 173 Î Nvidia
a c 274 U Graphics card
October 27, 2010 5:22:24 PM

dean vella said:
THX this was very usefull

1 question though.... I have a gtx 460 gs 1 gb would it be pointless in buying another same 1 or should i buy the 768mb 1 since of what i understood wouldnt make a diffrence and save 20 euro?

thx in advance

You can't SLi a 768MB GTX460 with a 1GB 460.
October 27, 2010 6:53:51 PM

Sure, because the TOP card would have to either downgrade itself, ( like crossfire), or just shut one card off...or not work at all if that is what nVIDIA likes to play.
a c 173 Î Nvidia
a c 274 U Graphics card
October 27, 2010 6:57:25 PM

dogman_1234 said:
Sure, because the TOP card would have to either downgrade itself, ( like crossfire), or just shut one card off...or not work at all if that is what nVIDIA likes to play.

They can't be SLi'd because the memory interfaces are of different sizes, 192 Vs 256.
October 27, 2010 6:59:29 PM

like I said...it may not work @ all.
a c 173 Î Nvidia
a c 274 U Graphics card
October 27, 2010 7:02:52 PM

dogman_1234 said:
like I said...it may not work @ all.

There is no "it may not" it just won't and this was made clear from day one when the cards were released.
a b Î Nvidia
a c 169 U Graphics card
October 28, 2010 3:37:15 PM

Edited again.
Special thanks to "mousemonkey" for helping me correct some information. :) 
November 8, 2010 9:53:31 PM

this was very informative 5/5
November 9, 2010 12:55:13 AM

Thanks! I knew you would like it

*winks to Maziar*

;) 
a b Î Nvidia
a c 169 U Graphics card
November 11, 2010 11:33:59 AM

^Looks interesting,thanks for sharing.
November 25, 2010 10:40:22 AM

?? would 2 x 1gb 6850's in crossfire beat a single 2gb 5970 ??

i read the 'scaling' on the new 68XX series kicks ass & takes names in crossfire compared to the allegedly superior 58XX series which i believe to be only an improvement as a single GPU over the 68XX's
November 25, 2010 1:52:58 PM

They might be referring to clock speed over the single-dual 5970. IDK, all I know is that the 5970 isn't the world's fastest card anymore.
a b Î Nvidia
a c 169 U Graphics card
November 25, 2010 3:04:44 PM

2 6850s will perform pretty much like a 5970.(They're a little slower in most games)
December 3, 2010 2:37:05 AM

just a biiiiig THANKS!
December 3, 2010 3:07:54 AM

so, not that much info has been given,( or at least I haven't been researching hard enough) but, will the 6970 be close to the performance of the 5970 without the 5970 price tag of 600 USD?
a b Î Nvidia
a c 169 U Graphics card
December 3, 2010 6:56:07 AM

No one knows currently,guess we have to wait till the middle of December.
December 14, 2010 11:17:44 PM

another FAQ is: If i have two monitors, do i plug one in each GPU or keep both in one GPU?
a b Î Nvidia
a c 169 U Graphics card
December 15, 2010 10:49:29 AM

If you are going to use CF,then you have to plug into both cards
January 7, 2011 8:25:19 AM

I am curious abotu the perforamance of a CF5770, SLI450, SLI460 768...
January 7, 2011 1:10:11 PM

There are benches around the Forum and Internet. Try searching Tom's first.
January 10, 2011 12:06:30 AM

Great thread it was very informative. There i was looking for info on SLi and found this little beauty. My question is solved "would it be possible or worth it to SLI link my Nvidia 9600 GT with me soon to be purchased Nvidia GTX570"
Answer: yeerrrrr.... No :) 
January 10, 2011 12:18:53 AM

Thor_3891 said:
Great thread it was very informative. There i was looking for info on SLi and found this little beauty. My question is solved "would it be possible or worth it to SLI link my Nvidia 9600 GT with me soon to be purchased Nvidia GTX570"
Answer: yeerrrrr.... No :) 


Exactly. That is like Crossfiring an ATI 5970 with a ATI 4350.
January 10, 2011 12:29:38 AM

Or trying to link a rottweiler's brain to a chihuahua's
January 10, 2011 12:31:53 AM

Thor_3891 said:
Or trying to link a rottweiler's brain to a chihuahua's


Or linking the rottweiler to the...well, you get the point.
January 19, 2011 2:47:42 AM

Thanks Maziar.... Great tutorial :) 
btw.. i noticed that your post was of year 2007. A very very long running thread :o 
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