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When I enable SLI I keep getting artifacts in random games and in Windows Aero sometimes .

It doesn't seem to be about over-heating as it happens randomly, and sometimes whole computers just crashes (not blue-screen, just black gone...)

My setup:

I've got the latest NVIDIA drivers and F5 BIOS update (*SLI update*). When I disable SLI and use the cards separately they are working just fine even in games.

Any idea why this might happen?

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Do you have a non-RC version of a Windows OS to try? nVidia doesn't officially support Windows 7 RC, so there's no ruling out the drivers as an issue until you're on a supported OS.

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