My first post on tomshardware.co.uk so bare with me
After reading a fair bit about unlocking those sexy Phenom II x2 550 BE cpu's to quad, I decided to get myself one and risk it.
I wasn't disappointed. The POST info was now changed to "x4" and Windows 7's task manager had 4 threads - sweeeeeeet!
After rebooting my computer a few times, I started experiencing my issue. When the 'Windows 7' animation showed up, the computer froze and rebooted. Second time same thing. After the third time Windows booted up normally and everything seemed alright. Left Prime95 a go that night and found no errors either so I decided to try using my pc normally.
Until today, every time Windows 7 finally manages to boot, everything runs as smooth as silk - with no BSOD's or anything - but I still have to put up with having it rebooting several times. If I turn off the 4th core (3rd in BIOS) it boots to Windows ok every time.
My question is: if the 4th core works fine under stress when Windows boots, is the 4th core defective? Is there a way of making it boot (that's not fiddling around with ACC which I've tried)?