VR-Zone mods XpertVision 7600GT videocard in a piece that is well worth reading. The XpertVision has a boosted reference clock speed - it is not based on the PCB design from Nvidia. The PCB, the HSF and the design of the card itself are quite different and that's a welcome change. After having modded it expertly, the maximum speed they could reach was 715MHz and 830MHz for the core and clock respectively!

The maximum clock speed before the mod was 608/756MHz. With still the default cooler and a +0.2v increase in GPU core voltage and +0.23v in Memory Voltage, I raised the GPU core clock from 608MHz all the way to 715MHz, and Memory clock speed from 756MHz all the way to 830MHz!! Looks like voltage really helps with the overclocking on this card. I think there is more should I continue to apply more voltage, however the card gets very hot at 1.55v with just the default cooler. It goes up to 64C during 3D applications so I would really really advice on getting better cooling before going on to voltage modding the card.