So I am having an issue (re-emerge) with my two GeForce 8800 Ultras (512MB, identical cards) in SLI mode. When I open up a 3D application, in this case Starcraft II, I get weird grainy graphics (like 8-16bit colors almost). The grainy/bad colors flicker periodically when the display changes (such as navigating a menu or loading a game) to normal good looking graphics. I had gotten this problem in the past when trying to play World of Warcraft and I don't remember how I got the problem to go away (could have been drivers, disabling SLI outright, or anything really -- it was a long time ago).
I had the 2nd card disabled and had not played any 3D games for almost a year since I had to focus on school work but when I re-enabled the card and turned SLI back on last night it caused the problem to return.
Each card has been tested independently and works properly. When I disable SLI in NVIDIA control panel, the graphics return to normal. Even oddly enough, I got the graphics to display normally when I changed a setting in the NVIDIA control panel that I think effectively neutered the benefits of having two cards in SLI: I changed SLI performace mode to "single-GPU" under manage 3D settings. I am not sure but I think it was originally on alternate frame rendering.
SLI indicates that it is active in the actual "SLI options" section of the control panel and I don't have any one card dedicated to physX processing either (it's set to auto).
Drivers are current too.
I would provide a screenshot but I am typing this at work and don't have one on hand right now but can provide one later if need be.
Any ideas what this could be?
ASUS P5N-E SLI Mobo
Intel Core 2 Quad 2.4GHz
4GB DDR3 RAM
Dual 160GB 10k RPM WD Raptors in RAID0
Dual GeForce 8800 Ultras 512MB
Soundblaster X-Fi Fatal1ty pro series sound card