XFX 7900GX2 Vmod, need help!

[SF3D]

First measure values from those resistor marked in picture. Then calculate size of variable resistors you are going to use. Measure voltages also, so you can see which voltage raise when you lower resistance

Intersil 6535crz: VGPU: That is REFIN method. Decrease resistance--> higher voltage.

Intersil 6549: VMEM. Decrease resistance--> higher voltage.