I don't even have Windows installed yet. I believe I tried manually setting the vcore, but I'll try again. I've heard that faulty PSU's can cause voltage fluctuation in different components and, frankly, the loud, high-pitched whine coming from the 850HX isn't too reassuring. Newegg is sending a replacement that will arrive tomorrow, so we'll see. If it doesn't change, I may start looking at the motherboard as the cause of the restarts. Any other opinions?