GPU Voltage Mod - Resistor Method

First of all, I would like to thank CaTalyst.X from the Extreme Overclocking Forums, who discovered this mod which I personally tested out. I would also like to thank my friend for providing his GeCube Radeon 9600XT as my "test subject".

This card uses a rare voltage regulator labeled "1575 PXCR" for the GPU, whose datasheet is impossible to find. Even the first pin of the resistor was not labeled.

You will need :-

• A 10,000 Ohm variable resistor
• Some wires
• A multimeter (preferably a digital model, with an accuracy of two decimal places)
• A soldering iron with a fine tip
• Some fine solder
• A magnifying glass
• Good soldering skills!

Got everything ready? Then let's start modding!

Before you actually start to mod, you should measure the default voltage of your card first. Locate the area outlined in the picture below.

That's where you will need to measure the GPU's voltage. Remember, you will need to do this with your system turned on.

Let's take a closer look at that area. See the labeled points? To measure the GPU voltage, you need to connect your multimeter's positive point to one of the labeled point; and connect the negative point to a ground point. They are all connected to each other, so just choose one.

You can either use your computer case or the Molex power connector's ground wire as the ground point. I personally prefer the Molex connector's ground wire because I can just poke the multimeter's negative point into the Molex connector and leave it there.

The GPU's voltage will usually be around 1.3V to 1.4V. But you must find out your card's exact GPU voltage before you mod it.