What are the temps in the bios? And what are you using for a monitor in Winblows? I have one of these boards myself running a UT server. Yes to overclock it you need to download and flash a hacked bios. I left it stock though. My temps seem to be ok. I got a XP1600+ in it with a CHROME ORB!!!

Stays cool, rarely sees 50% load as it is just a UT server.