Thanks for the info Lightman!
I succesfully did both Vgpu and Vmem mods with Sapphire X1300Pro :banana:
Default voltades on my card is: Vgpu=1.322V and 1.896V
Also I measure pin 5 (feedback) of RT9232a, default feedback voltage = 0.80V on both RT9232a's.
I use pencil, no soldering for now. Pencil method works fine for Vmem, but poor for Vgpu.
Vgpu: Pencil R610 from 150 ohm to 140 ohm (Vgpu 1.315V -> 1.40V) - I can't get more with pencil :(
Vmem: Pencil R710 from 767 ohm to 696 ohm (Vmem 1.896V -> 2.10V) - Can get more, but I tried running at 2.30V-2.45V and it was unstable. So 2.10-2.20V is enough for crappy DDR2 infineon.
First results with vmods (on my untweaked dirty WinXP):
2001: 21734
http://service.futuremark.com/compare?2k1=8833270
2003: 7221
http://service.futuremark.com/compare?2k3=4489025
PS. alternative vmod method: solder VR between Pin5 (Fb) and Pin7 (GND) of RT9232a.