Picked up on this via Stropp (who got it from Engadget). If you are using the latest Nvidia drivers, 196.75, you’ll want to roll them back. Apparently there’s a problem related to the fan controllers which can cause the card to overheat and possibly kill your GPU.
I looked at Nvidia’s support site, and you can’t even download the 75′s now. The current driver release for the 200 series cards for Windows 7 64-bit is 196.21, which is what I’ve been using since the end of January with no problems.