Thanks for the reply. I am using 4ghz 1.25V for my OC.
What are your temps?
Try upping the voltage to 1.27 or 1.28 ... see if that fixes your issue. Try 1.26 first.... Than slowly notch it up till the chip becomes stable. you can always do it in half as well, to dial it in. like 1.285. Note: personally I wouldn't go much over 1.3 personally. But some people seem to have no problem with 1.35~1.4, just be aware, the more volts you give the chip, the hotter it's going to run. My core voltage is 1.15 and is stable, as long as it's not crashing.... the lower the better.
My temps are at 59C at 3.5 ghz on all cores. Not wanting to push it! As I OC 24/7 running DC projects and I'm on Air... so... that's a factor as well!
AMD recommends not to run your TR over 68C. I have ran my chip in the 70's before... If you use AMD Master (I DO NOT RECOMMEND)... your temps will never go over 68C and the chip will thermal throttle no matter what setting you give it. Where as if you learn how to properly OC a chip via BIOS. The chip will run at whatever no matter what the temp. Again, some folks think anything less than 75 is safe to run. Use your own judgment. Personally, I don't like seeing anything over 72... but it the temps fluctuate at in the low 70's with a hard OC, you're probably ok.
Again, this depends on the user. Like me, running 24/7 I want to remain under 70. But for someone that only OC at 100% load for maybe a few times a day and is only hitting high 70's for short times, maybe that's ok. Shrug. OC is a risk each one has to take and feel comfortable with. Burning up a 800 dollar chip probably is to be best avoided. But, maybe...I'm just paranoid.