Ok we have two Vregs for the VGPU in paralell. They are the simplest type of Vreg... put a voltage in and get one out with one pin for setting it up via a resistor devider.
From looking at the card both Vregs are on the same resistor devider thats in the pic.
I havent done this mod myself yet as I havent even tested the card :P but its pretty simple.
This first pic shows the main components...
If you put a VR over the lower resistor in the devider you should get more voltage.
I think I will just replace this resistor with a VR.
The second pic shows the different voltage planes.. should anybody want to add some capacitance.. which may be a benefit.
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