Originally Posted by coelacanth
Take a look at your VRM temps. At 1.3v with both switches on you're going to be way over 1.3v and on air your VRMs are going to be very hot. Trying to pump even more voltage through it might cause it to artifact even more.
From reading all the 780 threads it seems that the higher you go on the voltage, the lower the core temp when you start seeing artifacts.
Take a look at this post:
Okay. So first things first, I turned both voltage switches off and flashed the stockln2 bios. After that I confirmed GPU boost is working on the stock ln2 bios. So, doing this, the stock volts measured with a DMM with no overvoltage at all was 1.25volts. At stock voltage, the vrm is reaching about 65-70c VERY FAST at only 1200 on the core. Anything roughly above this will cause my gpu to artifact.
Taking your advice
I undervolted the card using the classified tool to 1.1 volts which resulted in a DMM voltage of approx 1.155volts. Using this UNDERVOLT with limited testing I can achieve 1300 on the core, which was impossible at stock voltage. Also the VRM seems to have cooled down to approx 60c while the core is at 65c approx.
So now that I have found the cause of the artifacting, what should the VRM temp be? Is it possible that the cooler could have a bad connection to the VRM or such? If so, what would be the fix?