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Honestly, I'd ditch one of the cards. I had no end of problems trying to run dual 5970's, including blue screens.
Do 5970s not still have great resell value on the bay? With the bitcoin craze they were getting stupid amounts.
CCC 11.11 and CAP 11.11 fixed most of my issues. Only problem I have now is that the FPS can be eratic: Usually hovers around 100fps (BF3: All settings maxed, res: 2560*1440), then will randomly drop to 8fps, and slowly climb back.
Never had that in BF3, but make sure they are not overheating and throttling down.

Something to look into. I'll leave overdrive on another monitor and see whats the shizzle.![]()
Used afterburner, couldn't get the OSD to work but putting the graphs on a different screen worked just as well.
At Auto settings cards where reaching 85c, so I thought I'd ramp the fans to 50%. This dropped max temps in game to 52/53c. Lagging did not stop.
The only way I have found to stop the lag is dropping resolution to 1920*1080, dropping all anti-aliasing and HBAO. Still not perfect, and the fps avg has dropped from 100 to 50, but the fps drops have ceased which makes the game at least playable. Maybe the 11.12 drivers and CAP will solve a few more issues.
50% is less than auto.
Blue highlight each one at a time that you want OSD for an tick the OSD in yellow for each one as well.
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