well i used it to find the maximum clock speed and it crashed after it reached 730mhz. stock speeds are 648/1474/1242 core/shader/mem, and i can overclock to 670/1526/1299 at the max before it crashes during 3DMark06. is there any settings that might cause this in 3dmark? and there isnt a temp problem, at max during the test using ATItool it reached 50 degrees.