Originally Posted by S3phro
try dropping your nb/ht to 1800 and see if it runs ok then, or try giving the processor a lttle more voltage.
I had an issue at 3.7 with 4 cores where windows would run fine but programs would get irresponsive and it wouldnt pass any stress tests. I had to bump the vcore up a little and lower my ht/nb.
You could also just be unlucky and have a semi defective 4th core, dropping the ac on that core may make it more stable.
The above mite help you trouble shoot it abit, im aware your at stock speeds just trying to see how stable the core is.
thanks for the help, i tried almost everything exept lowering NB/HT freq. i give that a try but dont expect much
im already at 1.425V for it with stock speed so more voltage would definetely not pay of in the end...