Scrap my last, I was able to get rid of the shader problems by bumping the voltage up a notch.

Now I have found 3 possible varients that don't show shader glitches:

925MHz @ 1000mV
940MHz @1025mV
960MHz @ 1037mV

Of course I am aiming for the last one, so it's back to the furmark drawing board for an hour of stressing, bit worrying though, xtreme furmark, with all the settings to the max, and it's hitting just under 90C at the last settings. Ouch. Games rarely go above 60C though so it's not a major concern, I just don't want to make a habit of running furmark.

On another note, how hot do the RAM chips get when bumping the clock rate up, I was able to bump them up to 2550MHz before any artifacts. That would make it 5100MHz effective clock, yet the highest card out there, the gigabyte SOC is only at 4590 effective, which would translate to 2295MHz. So, is it safe to overclock that far, and how hot do these ram chips get, I have an MSI Frozr II OC, and I believe it doesn't have any RAM heatsinks?