The XpertVision 7600GT Sonic we reviewed just a short while ago is one of the most unique 7600GT in ther market, not just because of it's higher than reference clock speeds, but more so because it is one of the very few 7600GT not based on a reference PCB design.

Since it uses a different layout, our voltage modification guide based on the reference design we published a while ago will not apply for this card. However, modifying this card is as easy as it gets. It can be as easy as a pencil job.

The default GPU voltage for the card is 1.35v in 3D mode. The GPU Voltage can be measured from the point marked below, which is located at the back of the card:

Measure it with your multimeter and you should find similar readings. As with most XpertVision graphics cards, the voltage modifying spots are located at the front of the card instead.

For VGPU mod, to raise the core voltage from the default 1.35v, you can pencil the resistor marked above, under VGPU Mod. The original resistance of this resistor is 1152ohms and you should get similar measurements with your multimeter placed on this resistor. You can use light pencil strokes across this resistor to drop resistance and get an increase in voltage. Every 120ohms drop in resistance will increase voltage by +0.1v. Be very careful shading this resistor with your pencil... resistance can drop by quite a bit with just a few strokes, so do it lightly and be very very sure to measure the resistance of the resistor before you power up the system. Alternatively, soldering a 10K ohms Variable Resistor across this resistor, and set VR at max resistance of 10K ohms. Tune down resistance to increase voltage.

In the case of Memory voltage, the default memory voltage of this card is 1.87v as measure off the MOSFET leg shown in the picture above. Pencil the resistor marked in VMem Mod to increase voltage. Original resistance is 620ohms. Dropping resistance by 40ohms will increase voltage by +0.1v. Be very careful shading this resistor with your pencil and be very very sure to measure the resistance of the resistor before you power up the system. Alternatively, soldering a 10K ohms Variable Resistor across this resistor, and set VR at max resistance of 10K ohms. Tune down resistance to increase voltage.

Let me share my results from my quick tests:

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.

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