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SLI performance not quite what it should be?

post #1 of 11
Thread Starter 
So I ran the crysis bench with my 470s OCd to 800 core at 1920x1080/all very high/no AA with and without SLI. Without I get 38.99 FPS and with SLI 65.48 which is only 68% scaling.

When looking at the GPU usage you can clearly see the usage without SLI is much more consistant, which would seem to be the reason for the low scaling. Is this right?

    
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post #2 of 11
You don't get 100% more performance with Sli.
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post #3 of 11
Thread Starter 
Yes, I know you don't get 100% but 68% seems low. Mainly I was thinking of the gpu usage spikes as seen in the screen shots with SLI.

I ran the tests again with and without SLI, this time at stock clocks. The SLI gpu usage is more consistent without the OC but still not nearly as smooth as a single card.
31.35 single no OC
58.8 sli no OC

That's 87% scaling without the OC as opposed to 68% with the OC. And 24% OC improvement on a single card, 11% improvement in SLI.

This kind of seems like my PSU is reaching it's limits, but I'd think 850w is sufficient.
    
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post #4 of 11
Your psu should be fine. I believe mine is the same but with 10 more amps on the 12v rail.

Hmmmm......try a demo game's bench just so we have something more to go by. Try Metro 2033 benchmark.
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post #5 of 11
looks like momentarily CPU bottle necks...

don't worry about it...

it is normal

EDIT: that or HDD lag
post #6 of 11
Thread Starter 
Ok tried metro and watching the gpu usage chart SLI still seems fairly inconsistent, though not as bad as crysis.

I suppose my main question is....is it normal for SLI usage to be more inconsistent?
    
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post #7 of 11
well... more gpu power = more likely of a bottleneck somewhere else

so yes it is normal
post #8 of 11
Not all games scale the same.
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post #9 of 11
try 3dmark Vantage or Heaven 2.1
    
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post #10 of 11
Thread Starter 
Hmm well I guess that must leave it to drivers/game coding as I wouldn't think an I7 at 3.6ghz would bottleneck them. Shame I'd just love to have more consistent gpu usage, feels like I'm not getting all I could from them.

Thanks guys.
    
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