VR-Zone

Alright so you want to voltage modify your X1900GT Rev2, with that new cooler, changed PCB? No software voltage adjustments?

Sure, measure VGPU at any of the sides of capacitors marked on the back of your card:

So yes vgpu default at 1.13v.

Now locate the Volterra VT1165 chip behind the card.

Locate the resistor marked above. It should read about 10.9K ohms. Now pencil this resistor, such that it reads 5.9k ohms to 6kohms: Must be as close as possible! Or solder a 100K ohms Variable Resistor across the resistor and adjust resistance until the resistor reads 5.9k ohms to 6kohms: Must be as close as possible! This must be done before any voltage adjustments below!!

Now next step you gotta decide what voltage you want to run. Look below for 1.35v.

1.35v

Ok, use conductive ink, connect the side of resistor and the solder pad right beside as you can see above marked in green. It will give you 1.35v

For the following voltages, do similarly, the green line represents your conductive ink! For above 1.35v you better have some good cooling!!

1.45v

1.55v