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Lower FPS in SLI when playing Crysis 2 demo

post #1 of 15
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I tried out the Crysis 2 demo and I was getting some lag so I tried switching from multi-GPU mode to non multi-GPU mode and my FPS went up significantly. I Dont have this issue in other games so Im not sure what the problem is. I already tried turning down my OC in case it was a stability issue but that made no difference. Anyone have any idea why this is happening?

Do you think that there is no SLI profile for the Crysis 2 demo for a 295 yet or something? Is it a driver issue?
    
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post #2 of 15
demo does not support SLI nor crossfire
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post #3 of 15
Thread Starter 
Quote:
Originally Posted by dealio View Post
demo does not support SLI nor crossfire
Oh really? Why doesnt it?
    
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post #4 of 15
Got the same...

fps with SLI = 35
fps without SLI = 45 fps

Very disappointed...
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post #5 of 15
There's really no such thing as games 'supporting' or 'not supporting' crossfire or SLI.

The reason SLI doesn't work in this case (and in every other case when it doesn't work) is that the driver lacks a SLI profile associated with the .exe for the Crysis 2 demo.

SLI not working on particular game = Driver Lacks Profile for that particular game

This will be true about 99% of the time.

99% of games in the world have no concept whatsoever of multi-GPU setups (it so happens Crysis is an exception to this, as is Stalker CoP, but this is actually irrelevant to the issue at hand), and even when they do, you still need the driver to have an SLI profile.

An obvious tack would be to try renaming the .exe of the demo to 'crysis.exe'.
Edited by brettjv - 3/1/11 at 11:51am
    
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post #6 of 15
Quote:
Originally Posted by brettjv View Post
There's no such thing as games 'supporting' or 'not supporting' crossfire or SLI.

The reason SLI doesn't work in this case is that the driver lacks a SLI profile associated with the .exe for the Crysis 2 demo.

An obvious tack would be to try renaming the .exe of the demo to 'crysis.exe'.
A popular thing to change the exe to is rift.exe This seems to clear up all SLI/CF issues!
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post #8 of 15
Quote:
Originally Posted by Shane1244 View Post
There ya go ... like I say ... driver issue.

Always
    
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post #9 of 15
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I suspected it was because the driver had no SLI profile .. ive heard of this before for other games. Thanks for clearing that up guys.

Side note, Ive heard GTA4 does not support SLI .. maybe I will change that exe to rift.exe
    
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post #10 of 15
Quote:
Originally Posted by Kirby1 View Post
I suspected it was because the driver had no SLI profile .. ive heard of this before for other games. Thanks for clearing that up guys.

Side note, Ive heard GTA4 does not support SLI .. maybe I will change that exe to rift.exe
When renaming exe's it helps to get a game that has a similar graphic engine. Rift works for crysis 2 just because it is a modern game released around the same time. Its a vague comparison. Try to get closer if your going to try renaming exe's in the future!
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