Situate the chip labeled "Primarion PX3544" on the flipside of the card. Repair a wire on the middle pin and an additional one on one of the outer pins of a 500 Ω resistor variable. I for myself like to use those pins that make confrontation decrease when the alteration screw of the VR is turned clockwise consequently increasing voltage. Cut or insulate the 3rd pin, unused. Use the resistance calculating mode of your digital multimeter and tune the VR to utmost resistance (very significant!). You may want to write down on a piece of paper which way you need to turn the tuning screw in order to decrease resistance. Solder the free ends of the wires on the pads as depicted in the picture above training. Tune down the resistance to augment voltage slowly. Do not be worried if the first hardly any rotations do not seem make any distinction, this is normal. The further you turn the rotation faster vGPU increses - so tread vigilantly.
Always monitor the consequential vGPU with your multi meter while tuning. Red probe to the point marked with a green arrow labeled as "vGPU", black probe into a ground (Molex connector, eg.). VGPU default voltage for the GeForce 8800 GT is ~ 1.10 V under 3D load. 33% Overvolt (1.463 V under load) should be sufficient for maxing out the GPU under conventional cooling techniques. Note that vGPU impulsively increases by ~ 0.05 V when entering 3D load.
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