This latest ATI baby has a clock-lock at 862MHz for the GPU, 85MHz faster than default frequency. The RV670 GPU has multiple power phases internally, and PowerPlay is activated all the time. When you overclock the GPU, the PLL VCO divider goes bananas, which will overvolt the card just enough to cause a lockdown. One solution to the problem is a rather elegant video BIOS upgrade. This upgrade changes the dividers in the GPU, so you're free to go crazy and unlock the full potential of the card.

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