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[HELP] sli running worse than single card.

post #1 of 8
Thread Starter 
So, i have recently purchased a second gtx 660 to run in sli. When i put them in sli and run any sort of benchmark or game, i see a 40% decrease in performance.

System:
AMD FX-6300 @ stock speeds
8.00 GB ram
Msi 970a-g46 motherboard.
2x gtx 660
windows 7 home premium

Updated the drivers for the graphics cards.

What do i do now? Im completely lost.
post #2 of 8
Probably a bottleneck?
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post #3 of 8
Overclock your CPU. It's probably too slow to run 2 660's in SLI
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post #4 of 8
Thread Starter 
How would I be able to check to see if that's the problem without actually overclocking the CPU, am on a stock heatsink.
post #5 of 8
underclock your gpu. If performance is the same, cpu bottleneck.
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by poizone View Post

underclock your gpu. If performance is the same, cpu bottleneck.

Ok, thank you.
post #7 of 8
are your cards running 8x by 8x or 16x by 4x?
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post #8 of 8
Thread Starter 
It turns out the only problem was that the CPU was being brought down by cool and quite. Turned it off, and it runs like a dream.
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