Quote Originally Posted by quake6 View Post
With 1.15v I can do 836,but with 1.2-1.35v cant pass that clocks,it shows artifact... Voltage regulator are about the same like core... OC with riva tuner... And I solder wire to measure voltage and it shows 1.35...
Hmm ok. Mine is 1.15 default and 830 is about my limit too with the stock cooler. What are you using? I am thinking about getting an Arctic Cooling Accelro Xtreme 2900 but not sure if im keeping this card at this point...

You are certain that the voltage regulator is not getting hotter than the core? Also curious if you tested it with higher vgpu using ATI tool before you flashed the BIOS? Again, 1.35 is kind of high. If I were in this situation I would probably flash back to stock and "start over" but, again, I'm no expert here. Hopefully others will respond...