Quote Originally Posted by ngocrebel View Post
OK, after play around with voltage setting, I still cannot make it stable @4.0. It's surprise me because I can get in windows @4.0 easy but cannot make it stable? Can someone help me this? Thanks
If i am right you have Q9550? If its C1 you should really forget 4Ghz at start already! On E0 it is possible... easily on some situations. But on C1 and high vid it is pretty hard. Try get 3.6-3.8Ghz stable that would be best way to go.