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post #51 of 89
Could be a fatty cpu bottleneck. THose are very powerful cards.
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post #52 of 89
Thread Starter 
Okay been doing a little more testing and ran across something weird. When I enable crossfire and run furmark both gpu's go to 99% usage. Now here is the weird thing, when I disabled crossfire and run furmark or any game my computer uses the second card only! Why wouldn't it use to first card since it's a pci-e x16 lane? I've added pics to show what I am talking about. The first pic is with crossfire enabled and the second one is with crossfire disabled. Still getting negative scaling with CF enabled. Could this be an issue?

post #53 of 89
Thread Starter 
Anyone?
post #54 of 89
Its not using the second card, Afterburner just labels them wrong for some reason. It did the same too me. Afterburner is so buggy with crossfire its not even worth using imho. Just grab GPU-Z and get the usage and temps info from that. To watch both cards just run two instances of GPU-Z at the same time and select different cards in each instance from the drop down box.
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post #55 of 89
One thing to maybe check is your bios setting. Some motherboards have an option to select which PCIe slot to boot or select first. If you want to see which GPU is which in Afterburner, change the core, memory or voltage of one of the cards and then see which one shows the difference in the monitoring graph.
     
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post #56 of 89
Thread Starter 
Okay before I buy this Formula III board to try to eliminate the PCI-E bottleneck I need to make sure that this is what is causing the issue. Power supply has more than enough power? Cpu is not bottlenecked because it allows the GPU's to go to 99% while gaming? Any other ideas. I ran some more benchmarks. I should be seeing alot more performance increases than I am correct?

Far Cry 2

With CF @ 1600x900 = 53.26fps
With CF @ 4800x900 = 51.05fps

Without CF @ 1600x900 = 51.01fps
Without CF @ 4800x900 = 42.8fps

Crysis

With CF @ 1600x900 = 72.29fps
Without CF @ 1600x900 = 72.23fps

BFBC2

With CF @ 1600x900 = 110fps
With CF @ 4800x900 = 50fps

Without CF @ 1600x900 = 85fps
Without CF @ 4800x900 = 45fps

Left for Dead 2

With CF @ 4800x900 = 90-95fps
Without CF @ 4800x900 = 115-120fps

3dMark2011

Without CF = total 5045, graphic score = 5113
With CF = total 7820, graphic score = 9992

Does everyone agree that this is a PCI-E bottleneck issue? When in crossfire are my PCI-E slots both running at x4? or one at x16 and one at x4? Will two PCI-E x16 slots fix this issue? Thanks so much for the help.
Edited by charlesC8188 - 5/20/11 at 5:41pm
post #57 of 89
I will paypal you the money you paid for the board if it doesnt fix your problem. (You will have to send me the board)
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post #58 of 89
Thread Starter 
Quote:
Originally Posted by M0E View Post
I will paypal you the money you paid for the board if it doesnt fix your problem. (You will have to send me the board)
Awesome! I bought it a few hours ago. I thought that was a great deal myself. 85$ for a Formula III Am3 with 2 pci-e x16 slots. The seller has other great deals too.

Link: http://www.overclock.net/main-compon...i-formula.html
post #59 of 89
Quote:
Originally Posted by charlesC8188 View Post
Hmm. I see tons of reviews showing the difference between x4 and x16 PCI-e bandwidth and there is only a few FPS difference. Anyone else think this is the issue? My GPU's go to 99% usage while gaming, so it can't be a bottle necked CPU.
Yes and no, in benchmark and stress testing situations it really doesn't matter what slot you put your card in, but once you start gaming and using 2 GPUs it matters a lot.


Also, Crysis 2 and BFBC2 do preform oddly with crossfire, for a while in BFBC2 I was getting terrible framerates, changed my audio quality to medium and got a huge performance increase.

Crysis 2 still has tons of problems with crossfire, the game is unplayable for me due to the crossfire bugs. Five months now and it's still not fixed, yet they are releasing a DLC. I digress.

Haven't read too much of the thread but I saw you talking about purchasing a formula motherboard, you are buying an intel CPU with that too right?

And not sure if this was suggested, but flip the bios switch on both your cards, see if that does anything, doubt it will but it could.
Edited by Scope - 5/20/11 at 9:23pm
    
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post #60 of 89
Quote:
Originally Posted by charlesC8188 View Post
Okay before I buy this Formula III board to try to eliminate the PCI-E bottleneck I need to make sure that this is what is causing the issue. Power supply has more than enough power? Cpu is not bottlenecked because it allows the GPU's to go to 99% while gaming? Any other ideas. I ran some more benchmarks. I should be seeing alot more performance increases than I am correct?

Far Cry 2

With CF @ 1600x900 = 53.26fps
With CF @ 4800x900 = 51.05fps

Without CF @ 1600x900 = 51.01fps
Without CF @ 4800x900 = 42.8fps

Crysis

With CF @ 1600x900 = 72.29fps
Without CF @ 1600x900 = 72.23fps

BFBC2

With CF @ 1600x900 = 110fps
With CF @ 4800x900 = 50fps

Without CF @ 1600x900 = 85fps
Without CF @ 4800x900 = 45fps

Left for Dead 2

With CF @ 4800x900 = 90-95fps
Without CF @ 4800x900 = 115-120fps

3dMark2011

Without CF = total 5045, graphic score = 5113
With CF = total 7820, graphic score = 9992

Does everyone agree that this is a PCI-E bottleneck issue? When in crossfire are my PCI-E slots both running at x4? or one at x16 and one at x4? Will two PCI-E x16 slots fix this issue? Thanks so much for the help.
IDK what's going on, even with the x4 limitation you shouldn't have negative scaling.

I tested several games when I had a vanilla P67 board, never had negative scaling.
Just noticeable slow downs when compared to x8/x8.
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