So I switched my 6950's BIOS to unlock the shaders, making it basically a 6970. I use Sapphire Trixx to OC the core clock to 880mhz (6970's stock) from 800mhz (6950's stock) and the memory clock to 1375mhz from 1250mhz, 6970 and 6950's stock speeds, respectively. I get some crazy artifacting/flickering crap whenever I do something that refreshes the screen like opening a different window or quickly moving the mouse. So I restart and try again and increase the voltage by .5 volts, same result. So I try MSI Afterburner. Only lets me OC to 840 and 1325. No artifacting though, I even ran Furmark for 15 minutes. Any idea why this is?