Reports are circulating around the web that the latest version of the WHQL drivers for Nvidia cards are causing cards to run their fans a lower than necessary speeds to keep the GPU cool. Here is a list of the cards that *may* be affected:
* GTS 250
I have an older 8600GT setting around I use on a linux box. So, no problems for me. According to Nvidia you should uninstall the 196.75 version and go and download the 196.21 version. The 196.75 version has been pulled, so you should be able to get the older ones easily.
It seems that the new drivers have fixed these issues.