graphics card, right click desktop/propertise/settings/advanced/click on your card, there should be a option there.
The BIOS is the best bet, but speed fan, everst, motherboard monitor 5.
I still stand by it being the PSU making that noise, due to being under too much strain.
When you play games, the CPU heats up, and there is more demand on the PSU, and PSU's are less efficient at higher temps as well.