well if it works fine at stock then you know its because of your OC, Did you monitor the temps, The stuttering may be caused by the CPU getting to hot and throttling down, in an attempt to stop itself from burning up.
OR It could be your memory, did you manually set the currect timings and voltage?
yep i manually set the timings and voltage found on the ram sticker and even checked ocz website to be sure. my cpu temps are between 35 C to 40 C during max load, I have a corsair h50. do you think it's the ram doing that? is that what bottlenecking looks like? the timing is 5-6-6-18 @2.10v
I'm using Core temp version 0.99.5 32 bit, I don't know if it's really posting the correct temps but it's posting those numbers. I have 2 side fans that's blowing the air out of the case, 1 front intake fan and the rear fan is the intake for the h50 radiator. The 4890's fan is manually set at 100% to provide additional air circulation and push the hot air toward the 2 side fans. I did run memtest on my memory sticks before and they showed no errors, maybe now it's beginning to fail? I'll do memtest again.