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SLI / CrossFire FAQs - Page 19

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a c 173 Î Nvidia
a c 274 U Graphics card
August 20, 2011 5:52:42 PM

@12reno, Start a thread of your own and reference this thread if you need to.
August 20, 2011 6:36:34 PM

5670 can't be fired with 6670 :( 
August 22, 2011 5:54:39 PM

I just read the sli-crossfire and micro-stuttering article, and it got me thinking. All the 2 card configuration had the first card shoot out a fast frame, and the second card would lag, which causes teh microstuttering. What would happen if the second card was overclocked? Theoretically, that would improve stuttering significantly, or even...cure it!
Quick! Someone with a crossfire-sli setup make this happen!
Related resources
Can't find your answer ? Ask !
a c 173 Î Nvidia
a c 274 U Graphics card
August 22, 2011 6:03:14 PM

stingstang said:
I just read the sli-crossfire and micro-stuttering article, and it got me thinking. All the 2 card configuration had the first card shoot out a fast frame, and the second card would lag, which causes teh microstuttering. What would happen if the second card was overclocked? Theoretically, that would improve stuttering significantly, or even...cure it!
Quick! Someone with a crossfire-sli setup make this happen!

I firmly believe that if 'microstuttering' exists/happens then it's due to a weak CPU with a lack of onboard cache that causes it.
August 22, 2011 7:09:25 PM

Mousemonkey said:
I firmly believe that if 'microstuttering' exists/happens then it's due to a weak CPU with a lack of onboard cache that causes it.

The article on Tom's had a hardware setup with a 2500k @5GHz (don't tell me how they got it all the way up there)
I doubt it was from the cpu not being able to handle it.
Another worthwhile test would be to see if the effect is worse when that cpu is clocked lower..
August 27, 2011 3:26:46 PM

nice job, can u provide PSU list too,
a c 173 Î Nvidia
a c 274 U Graphics card
August 27, 2011 3:29:57 PM

stingstang said:
The article on Tom's had a hardware setup with a 2500k @5GHz (don't tell me how they got it all the way up there)
I doubt it was from the cpu not being able to handle it.
Another worthwhile test would be to see if the effect is worse when that cpu is clocked lower..

Increased clockspeed does not always seem to make up for lack of onboard cache from what I've seen over the years.
August 31, 2011 4:05:02 AM

May I just ask a simple question.. I know I should try to read this whole thread but there are almost 20 pages here.
>,< My eyes are already sore.
I would just like to ask if I will get any improvement on performance if I do SLI with my GTX 460 even if I don't plan to use more than 1 monitor or display.
Thanks in advance!
a b Î Nvidia
a c 169 U Graphics card
August 31, 2011 6:35:22 AM

If you play on resolution like 1080p,then adding another 460 will give you a great boost in performance.
a b U Graphics card
September 9, 2011 2:53:55 PM

This has to be added some how to the OP, Maziar:

http://techreport.com/articles.x/21516

One of the best reads lately! Very enlightening about XFire and SLI caveats. Finally a metric for micro stuttering and jitter!

Cheers!
a b Î Nvidia
a c 169 U Graphics card
September 9, 2011 5:33:33 PM

Thanks for the link :) 
Will probably add info about micro stuttering
September 10, 2011 3:40:20 PM

Ok what would be better, GTX560 Ti Sli or a single GTX580. I am using a 24" display
a b Î Nvidia
a c 169 U Graphics card
September 10, 2011 9:20:11 PM

2 560's are cheaper and faster but consume more power and are noisier
October 10, 2011 6:22:17 AM

Maybe there should there be a notice that Crossfire / Sli doenst work if you play games in Window mode. And it only runs on 1 card if so. its been awhile since ive been playing around with sli / crossfire. DX11 should have fixed that problem, but it didnt fix it for me.
a b Î Nvidia
a c 169 U Graphics card
October 10, 2011 8:05:01 AM

Good point,I'll add it :) 
October 20, 2011 4:29:02 PM

Hello there guys,

I was atcualy wondering at 1 thing. I am planing to get one 6870 now , and probably add another one later. They require 2 PCIE power connectors each, so should my PSU have 4? I see some 650w models (I hope 650w should be enough) have just 2 but are marked as CF/SLI ready.

Thanks
a b Î Nvidia
a c 169 U Graphics card
October 22, 2011 9:13:22 AM

Your PSU has to have 2 PCI-E 6pin connectors.
I recommend a decent 700-800W PSU such as Corsair AX series.
October 25, 2011 1:27:38 PM

Hi masters,
I'm planning to build a rig, but I'm kinda confused with some parts. What PSU can you suggest for a rig with dual SLI GTX 580 and i7 2600k? Should I go for Corsair AX-1200? Many thanks! :) 
a c 173 Î Nvidia
a c 274 U Graphics card
October 25, 2011 4:33:54 PM

EyeSeven said:
Hi masters,
I'm planning to build a rig, but I'm kinda confused with some parts. What PSU can you suggest for a rig with dual SLI GTX 580 and i7 2600k? Should I go for Corsair AX-1200? Many thanks! :) 

This is not a question and answer thread, please start your own thread for that.
a b U Graphics card
November 22, 2011 4:34:22 PM

EyeSeven said:
Hi masters,
I'm planning to build a rig, but I'm kinda confused with some parts. What PSU can you suggest for a rig with dual SLI GTX 580 and i7 2600k? Should I go for Corsair AX-1200? Many thanks! :) 

My safe bet would be a 1000watt psu. With plenty of amps on the (12v) rail... :bounce: 
a b U Graphics card
November 27, 2011 10:51:15 PM

just saw this chart. can u really crossfire a 5770 with a 6770?

November 28, 2011 5:46:39 AM

I really hope this question hasn't been asked, but I read through the first few pages and the last page of this forum and didn't find my answer.
I currently have a 5970 and a 5870(2GB) crossfire set up, and running 3 27 inch monitors. But here's the thing...

I am not sure if my crossfire set up is working properly. I don't have any error messages, and running everything at its default within the catalyst control Center. But I feel like I should be getting better frames per second. When running the 'Heaven DX11 benchmark' at these settings: Shaders-high tessellation-normal Anisotropy-4 Anti-Aliasing- off res 1920x1080 dx11
I average more than 60 frames per second with crossfire enabled, and noticed a decrease by about 15 frames with crossfire disabled. But the real problem I'm worried about is that when catalyst control Center is monitoring activity only the first GPU of my 5970.

Would it show activity on all GPU separately, or are all the GPU's treated and monitored as one even within CCC?
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Gigabyte EX58-UD4P
Intel core i7-950 @3.06Ghz
patriot gaming series 9-9-9-24 DDR3 (1600Mhz) 12GB
diamond ATI Radeon HD 5870 Eyefinity 6 edition
X FX ATI Radeon HD 5970 Black edition
OCZ agility2 120GB solid-state X2 RAID0
Xion PSU 1000 W
a b Î Nvidia
a c 169 U Graphics card
November 28, 2011 6:52:13 AM

Open GPU-Z(3 of them) and set each to monitor 1)First 5970 core 2)Second 5970 core 3)5870 and then run a game or benchmark for 5-10 mins,then minimize it(don't quit) and check the GPU activity
November 28, 2011 5:46:51 PM

thank you for the quick response.
I had attempted to monitor the activity with GPU-Z while running a benchmark with and without crossfire. Without crossfire it ran as expected, averaging 50 frames per second and only the first core of my 5970 had activity. But when running with crossfire I was averaging 70 frames per second, but only the 5970 core one showed activity again. This tool claims that I have three GPU's in crossfire. Does crossfire maybe treat all GPU's as one? So even when you attempt to monitor, it will seem like the others won't be working. There has to be an explanation for my increasing frame rates, rather this is the second core been active or all three. I would think our performance would be even greater if all three were active.
a b Î Nvidia
a c 169 U Graphics card
November 29, 2011 7:08:27 AM

Take your 5870 out and test only with 5970 and check if both cores work or not
December 1, 2011 8:46:18 PM

I'm sorry it's taken me this long to get back to you. I had tried to monitor activity of my 5970 without the 5870, and I have the same effects as I did disabling crossfire. I did notice the second GPU would stay at 157 MHz for the core clock and 300 MHz for the memory clock,and sometimes the GPU load would go to 6% but only for about 1 second, while the first GPU is at a steady 99 to 100%. Also in the GPUZ under my 5870 ATI crossfire says "disabled" however on the 5970( both GPU's) it says "enabled (3 GPUs)". with crossfire disabled crossfire will read "enabled (2 GPU's)"
with your crossfire setup can you monitor the load of each GPU?
a b Î Nvidia
a c 169 U Graphics card
December 3, 2011 5:02:58 AM

That's really strange,what OS are you using ?
December 3, 2011 4:50:35 PM

I am using Windows 7 professional 64-bit.

I just updated to the most recent version. I also tried viewing the GPUz tool while running portal 2 (5760X1080) as I have read it supports crossfireX. But it was still the exact same effect as my other benchmark.I did buy my 5970 on eBay for $450 which I thought was a steal, I'm hoping both cores are functioning properly. Even so crossfire should be working with my 5870. I have tried the two different crossfire bridges that came with each card, I am really lost at this point.
December 4, 2011 2:52:04 PM

I would use MSI Afterburner, and set up the overlay to display your GPU usage. You should be able to see your GPU utilization in game that way.

I bought a 5850 at release and a few months ago purchased another one for CF. They worked great on my AM3 board, but when I upgraded to a Z68 windows would randomly not recognize one card. When I switched the cards around that stopped, but I had crashing problems in games so I gave up.

The cards I had were different revisions, and that Z68 didn't seem to like them. It might be your cards just aren't gonna want to play together?
December 7, 2011 5:29:57 PM

Again I'm sorry for the long response time. I love MSI afterburner! I have a G 19 Logitech keyboard so I'm able to monitor everything on its LCD while in game. I first tested Skyrim, and only one of my 5970 cores were being used. However I still don't think Skyrim supports crossfire X. Then I tested a plethora of other games and it seems that all my cores are being used at max clock rate and memory ( minus the fact my 5970 bottlenecks my 5870 VRAM, memory and core clock). Thank you all so much for the help! I had one more question, what is a safe temp for my cards? I feel like they are so close in my case they're going to catch fire.
a b Î Nvidia
a c 169 U Graphics card
December 12, 2011 6:52:10 AM

mebuebu said:
Again I'm sorry for the long response time. I love MSI afterburner! I have a G 19 Logitech keyboard so I'm able to monitor everything on its LCD while in game. I first tested Skyrim, and only one of my 5970 cores were being used. However I still don't think Skyrim supports crossfire X. Then I tested a plethora of other games and it seems that all my cores are being used at max clock rate and memory ( minus the fact my 5970 bottlenecks my 5870 VRAM, memory and core clock). Thank you all so much for the help! I had one more question, what is a safe temp for my cards? I feel like they are so close in my case they're going to catch fire.

When I had a 5970(reference),it ran max @ 85c under load.So I assume anything up to 95c is fine(since you're using another 5970 and a 5870)
January 18, 2012 2:29:57 AM

Ummmmmm.... I need some help with AMD APU crossfireing. I just got a family member a new computer with an amd A8 apu 3800 model. now I would like to know which card would be best to hybrid crossfire the APU with, without requiring a 6 or 8 pin power cable, since the computer came with a crappy PSU.
a c 173 Î Nvidia
a c 274 U Graphics card
January 18, 2012 8:00:03 AM

@ herpaderp, Start your own thread.

a b U Graphics card
January 27, 2012 1:29:17 AM

Q. For maziar, you are a mod but you asked another mod to make it a sticky (in 2007)?

you can include some examples of comparisons of duel/triple sli/cf to equivalent single card config for reference model in performance and power consumption.
a b Î Nvidia
a c 119 U Graphics card
January 27, 2012 4:30:31 PM

truegenius said:
Q. For maziar, you are a mod but you asked another mod to make it a sticky (in 2007)?

He was not a mod back in 2007 :p 
a b Î Nvidia
a c 169 U Graphics card
February 3, 2012 5:42:30 AM

@truegenius
Yes I wasn't a mod in 2007,that's why I asked other mods to sticky the thread.
The reason I haven't included performance comparison is because some games don't benefit from 2 or more cards,as a result,in one game 3 cards may perform worse than 2,so adding benchmarks may not be suitable;furthermore,both AMD and Nvidia release hotfixes/new drivers for each game which sometimes make a notable change in benchmarks.
a b U Graphics card
February 7, 2012 4:53:16 PM

incredible maziar keep it up!
Really appreciate.

A big thanks to you.
a b Î Nvidia
a c 169 U Graphics card
February 8, 2012 11:11:58 AM

No prob :)  glad you liked it
February 14, 2012 1:26:30 AM

Can someone help me out on a crossfire issue? I purchased my second 6850 to go crossfire. I plugged it in, CCC recognizes it and recommends to turn on crossfire, unfortunately, I try to select the option to enable it and its grayed out. CCC lets me adjust clock speeds, though. Even speccy is saying that crossfire is disabled, yet see both cards. GPU-Z sees them as well and so does afterburner. Is this a problem? Is crossfire really enabled but speccy just can't recognize it? I know my board supports it (990FXA-UD3) and I have an adequate PSU(Corsair TX750M). I tried uninstalling all the drivers and CCC and reinstalling, even trying out earlier version of CCC, still same problem the grayed out option and speccy saying its disabled.

http://i31.photobucket.com/albums/c356/junitono1/Untitl...
February 24, 2012 8:41:49 PM

Hi,

Can someone tell me the answer to a general question - when in SLI (I have 2 x Asus GTX580's @ 782 MHz) does one card always get hotter than the other?
I'm playing BF3 and one is 98C and the other is 62C. I think these cards are rated to 105C (or is it 95C?) but that seems pretty excessive. On a single GTX480 it never went above 82C.

Thanks
February 25, 2012 7:36:46 AM

Quote:
1.) air-flow / cross ventilation in your case.
2.) possible different monitor resolutions, what is your monitor set-up.?
3.) does it happen in any other game besides BF3.?


Thanks Malmental. I've started a thread out in the forum.
March 3, 2012 4:23:04 AM

what mobo do u suggest for ati 6790 my ram iss ddr2 i am searching for a fine ddr 2 board
a b Î Nvidia
a c 169 U Graphics card
March 5, 2012 7:30:06 AM

DDR2 boards are hard to find.You have to look for (used) P35/P45 boards(some models support DDR2 RAMs)
a b Î Nvidia
a c 169 U Graphics card
March 5, 2012 10:08:54 AM

rahiarain said:
i have decide for gigabyte ga-x38-ds4 it supports ddr 2.what do you think about the power supply? i am confused in these two
1 : http://www.coolermaster.com/product.php?product_id=6641 and
2 : http://www.coolermaster.com/product.php?product_id=5906...
will they support crossfire? gx 550w supports nvidia sli what about crossfire

2 6790's require a more powerful PSU.Consider Corsair HX650/750 instead
March 5, 2012 4:24:14 PM

Maziar said:
2 6790's require a more powerful PSU.Consider Corsair HX650/750 instead

thanks very much
a b Î Nvidia
a c 169 U Graphics card
March 6, 2012 3:14:51 PM

Better than before I hope
March 17, 2012 7:55:11 PM

Just hit this, now that I got the new driver for my GPU 3DMarkVantage worked. thought my driver was up to date and it was pissing me off but I guess it wasn't, made me feel stupid. score is pretty good considering I built this PC for about $700
the "High" test scored 13,681 GPU 13,841 CPU 12,838
I think I'll buy another one of these cards and run SLI since they are only 227,000 KRW here in Yongsan
Was using a GTX 260 in it but I was only scoring about 8700 on the 3D Mark Vantage and I recently switched to the ASUS ENGTX 560Ti and now im scoring up in mid 13k awesome
http://3dmark.com/3dmv/3965741

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