You're running blend test. The beginning iteration (1024k) of blend test is very easy to pass. Passing 10 minutes proves nothing for stability. For CPU stability you want to be using small FFT, blend is more like CPU + memory which you should test after you stabilize small FFT. I had an Athlon 630, and it clocked like crap. You're going to need a lot
more voltage if you expect to get close to 4ghz, more like 1.6v+. Actually 4ghz is probably not going to happen on that CoolIT, you're better backing down and finding a good stable 24/7 clock.
Just to show you how bad Athlon II X4s overclock, look at this
He needs 1.568v just for 4ghz and he also needed to disable 2 cores just for a validation
. You're probably not going to make it to 4ghz Edited by Dopamin3 - 1/4/11 at 9:43am