It worked! Thanks to pc ice and diamonddog.

Albatron Ti-4800-v Medusa
On my card the test voltages under the cap and on the leg measure the same. Stock was 1.76 GPU and 2.9 DDR.

I used a 50K ohm vr for the gpu (pin 5 and 6 on sl6525cb).

Stock = 1.76
45K ohm = 1.79
38.5K ohm = 1.8
15.6K ohm = 1.85
10K ohm = 1.9

For the ddr (pin 1 and 10 on isl6225ca) I used a 200K ohm vr.
For pin 10 it’s easier to follow the trace and solder to the resistor next to it.

Stock = 2.9
180K ohm = 3.0
100K ohm = 3.1
79K ohm = 3.15
67.5K ohm = 3.2