I'm new to over clocking and am currently trying to get my 920 D0 working at 4.2 Ghz, I know my CPU Voltage is still a little two low (1.275) because it will crash prime 95 after 20-30 min, the thing i find kind of odd is that after about a couple minuets the cpu load goes from 100% to 75% but my temperature never goes above 55-57 degrees (according to real temp 3.4 and core temp 0.99.5) and nothing on CPU-Z changes (multiplier, bus speed core volt). My question is, what is telling my computer to throttle down to 75%? is it prime 95? I'm assuming there is something that knows that there is insufficient voltage?
Uh, did you check the worker threads of prime95? One of them might have return a "FATAL ERROR" or something similar. The moment a thread fails, it halts execution. So if one of your CPU cores went bad with the calculations, the thread stops. If you have 4 cores, and one of them stop being used, you would have 75% load (3 out of 4 cores at 100, the last one 0). Do you have hyper threading on? That would give you 8 logical cores. Two or three cores failing would give you 70-80% usage.
Ya that was what it was, I didn't realize that if there was an error that it would just shut down one of the cores (though it makes perfect sense). And I do have hyper threading off. I upped the voltage a bit and it's been running stable for the last 2 hours. Thanks for your help guys!