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Worse Crossfire performance than signle card.

Last response: in Graphics & Displays
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November 28, 2012 2:25:30 AM

Hello all,

I have come here hoping someone has an answer to my problem. I recently purchased 2 Saphire 7850 1 gb cards and have them in crossfire.

The issue that I am having is that I have SLIGHTLY better performance with a SINGLE card. Examples of this are the ARMA 2 benchmark ran 50 fps single card and 46 fps in crossfire. CS Source stress test resulted in 297 fps single card and 296 fps crossfire.

Obviously you can understand why this would be disappointing. I have tried the drivers that came on the CD (12.3?) as well as the latest AMD drivers,

My system is:

Asus m5a97 (970 chipset with 16x and 4 x pcie lanes)
AMD phenom 955
Corsair 16 gb ram
2 Saphire 7850's
Corsair 850 watt PSU


Anyway, I have searched for answers for a few hours and also tried everything I could think of in order to fix this issue. Anyone ever heard of this happening?
November 28, 2012 2:39:57 AM

Well, i never cfed before, but did you do the following?

1. Get the newest catalyst

2. Get the Catalyst Profile Under it and install it.

3. Engage Crossfire in CCC. I never used "legit cf" before, just hybrid.

http://support.amd.com/us/gpudownload/windows/Pages/rad...

windows 7 64-bit

-Maybe your phenom ii X4 is bottlenecking? I don't know how dual cards work.

-Crossfire and SLI does not support all games and certainly does not scale as well as we like to in many games.
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November 28, 2012 2:49:43 AM

Yes I did all of the above. I am going to get 3d mark and give that a go.
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November 28, 2012 3:18:21 AM

OK 3dmark benchmarks how I would expect

Crossfire: 10554
Single Card: 5311

So I guess this is considered working properly :/ 
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December 1, 2012 11:56:28 PM

03protege said:
OK 3dmark benchmarks how I would expect

Crossfire: 10554
Single Card: 5311

So I guess this is considered working properly :/ 


Unfortunately, SLI and CF only support popular games. So, in a way, at least, it is guranteed to run bf3 and skyrim better ;) 
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