Ok, so that answers one of my unasked questions: are you going up slowly or just jumping right to 3.7Ghz. I *still* think the problem may lie with northbridge and southbridge. try adjusting those voltages marginally (don't you hate the six million reboots!) I've seen people taking about FSB stability in the 450+ region for this Mobo and CPU. You've got to be careful though as there are a lot of skites on the forums who don't post proof. One troll said he was getting 520!