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Need help for 7950 crossfire setup! exchange 2 cards position and performance lost a lot

post #1 of 5
Thread Starter 
I owned 2 sapphire 3l 7950s in crossfire. Recently I found the upper/primary card is hot, staying around 85 degrees in heaven 4.0 test, while the bottom card stayed around 75 degrees. What's more, the bottom card has a higher ASIC quality, so I decided put the better card on top. I can achieve 1800 in heaven 4.0 @1140 1500 at 1.25v for both cards, but after I exchanged their position and overclocked them at the same frequencies and voltage as before, they can only get around 1550 points in heaven 4.0. I used atiman to do a clearly driver uninstall and disabled override and ulps. Both cards run at above 95% usage and the frequencies are stable. I find nothing by google, so I'll appreciate any help.
post #2 of 5
Quote:
Originally Posted by Mars0422 View Post

I owned 2 sapphire 3l 7950s in crossfire. Recently I found the upper/primary card is hot, staying around 85 degrees in heaven 4.0 test, while the bottom card stayed around 75 degrees. What's more, the bottom card has a higher ASIC quality, so I decided put the better card on top. I can achieve 1800 in heaven 4.0 @1140 1500 at 1.25v for both cards, but after I exchanged their position and overclocked them at the same frequencies and voltage as before, they can only get around 1550 points in heaven 4.0. I used atiman to do a clearly driver uninstall and disabled override and ulps. Both cards run at above 95% usage and the frequencies are stable. I find nothing by google, so I'll appreciate any help.

The top card will always run about 10C hotter. That's just a disadvantage of Crossfire/SLI.

ASIC quality has not been proven to make a difference in OCing.

As for the difference in Heaven, I have no clue. It shouldn't make a difference in which card is on top or bottom. You might want to make sure they are both actually running at their OC that you put them at. Sometimes the second card doesn't accept it. It's just weird.
post #3 of 5
Thread Starter 
I checked gpu-z and afterburner monitor. It seems both card were running at the right clock.
post #4 of 5
I assume you weren't running the benchmark full screen when you were looking were you?
post #5 of 5
Thread Starter 
No, I was running full screen and crossfire worked properly.
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