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Old Jun 14, 2009, 12:58 PM   #1
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andrewshenk
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Default 4850 x2 Very odd Problem

I had been having some questions about poor performance in games like Crysis and Left 4 Dead on my new 4850 x2 system, and I believe I've got some idea of what the (very weird) issue is. When running benchmarks like 3dMark Vantage and Furmark, I've opened up two copies of GPU-z, and seen that both GPU cores on the card are at full operation, Crossfire is working perfectly. However, once I start up a game (any game, I've tried 4 or 5 different ones), only one GPU core is put into use. What kind of driver issue or conflict could be causing Crossfire to only function in benchmark tests? I'm running Windows 7 RC1, with Catalyst 9.5 drivers. I've tried reinstalling them multiple times, gone back to the 9.4 drivers, and have still had the same issue. I've checked and unchecked "enable Crossfire" in the Catalyst Control Center a dozen times, and when disabled everything runs off a single GPU, but when enabled again, only benchmarks do.
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Old Jun 14, 2009, 02:58 PM   #2
kn00tcn
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Default

is something up with 4850x2 cards or what? they're the only x2s that have the crossfire option in CCC, 4870x2 doesnt

http://rage3d.com/board/showthread.php?t=33946896 & here's a 4850x2 user with random games not having working CF

i havent run into such issues on my 4870x2
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