This trick might actually work with more cards than just my Nvidia Geforce 6600 GT card manufactured by MSI. The default fan noise is so irritating that I was looking for ways to either turn it down by software, bios upgrades or replacing the fan. I preferred the software method over flashing the bios over buying a new fan that could replace the old one. After consulting google with searchtearms like geforce 6600 fan speed, reduce fan speed geforce and similar strings I finally found a forum entry that was about the problem I faced.

