So I initially had just 1 Sapphire 6950 2GB OC, but then while out of town I decided to get another to try crossfire for the first time. When I hooked up my second one it worked fine, and I was seeing about double scaling (Furrmark 37 FPS -> 67 FPS). However when I arrived home and set everything up again, I encountered a lot of problems. It started when I decided to try to use less voltage. In MSI afterburner I changed it from 1.1v to 1.065v (My only options). This gave me less performance, so I switched it back. Then BAM the issues begin!
-On Furrmark it says I have 1 GPU, and I am getting 58 FPS (Not 37 or 67).
-Some games are acting retarded. On Max Payne 3, it gets 45 FPS on ultra with Vsync off, and 60 FPS with it on!
-Metro: 2033 gets ~45 FPS on Ultra settings (1080p, very high, DX11, No Physx, AAA). It should be getting 50-60 FPS.
-> I tried uninstalling everything AMD, and then reinstalled everything. It made furmark get 66 FPS, but then when I turned Crossfire off and on, the problems came back. Even when furrmark worked again, Metro still only got 45 FPS.
WTF DO I DO?!?! everything was fine! Please help!!!
-i5-3570k at stock speeds while heavily undervolted (50w being used!)
- 2x4 GB 1600 MHz RAM
-ASROCK Z77 Pro4-m ( I realize that the second card is using a x4 PCIE)
-1 TB 7200 RPM 6.0 GB/s 3.5" HDD
-2 x 1080p 23" Tv's. 1 for gaming and desktop, the other for extra screen space and apps on the side.