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.
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9/21/13 at 6:14pm