I have the same problem with my HD4870 but with FurMark, after 2 mins of running FurMark, VDDC last reported 83.5 Amps, the screen goes black and the D601 red LED lit - critical Core power fault => so I'm pretty sure this is ATi/AMD's defect, not Tetedeinch's fault.

/If someone say "This test is unnecessarily stress my vid since my games play fine", I think they just can't bear having a defective card. Imagine in the very near future, when some developer write a game or a GPGPU app that can pust your GPU to its limit and you won't able to run them because of ATi's fault, what do you think :P