Sapphire HD5850 Xtreme / HD6850 Volt-Mods (vGPU & vMEM)
overview
The PCB is identical to those of HD6850s with AMD reference design. This means these mods can be used for HD6850 as well
A 4-phase switching regulator, which is located between the GPU and output panel, controls the GPU voltage. For the memory a simple single phase switching reg is beeing used.
*Spannung=voltage
*Last=load
voltage measurement
output caps of both switching regs are always a good spot for voltage readings. though the little MLCC at the back of VRAM ICs and GPU will give you a more accurate reading.
If u are using software like Trixx to adjust vGPU be aware that those values are different to the real voltage. Here's a table with exact measurement:
*Spannung=voltage
*Last=load
vGPU mod
IC: CHiL 8214
FP Pin: Pin 4 (VSEN)
original resistance: 12.4 Ohms
recommended VR size: 500 Ohms
*Masse = ground
*put a 500 Ohm VR between FB Pin and GND
vMEM mod
IC: APW7165
FP Pin: Pin 6
original resistance: 5010 Ohms
recommended VR size: 200k Ohms
Pin 3 is a good ground spot. A pencil mod is possible alternatively
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