ECS nForce4-A939 Voltmods
VDIMM & VLDTDatasheet of the LM324 controller:
This controller is responsible for Vdimm as well as VLDT.
VDIMM (left side of the LM324 according to the picture)Connect the 200K and the 10K potentiometers in series, thus getting a total resistance of 210K. You could also only use the single 200K poti, but I like to have a bit more precision using the additional 10K poti to adjust the voltage when the changes are too high using the 200K poti alone (mostly in the lower K-Ohm-range). Finally just make the connection between pin#3 and pin#4(VCC) like shown in the picture.
VDimm and VTT Measure''
For the VLDT-mod you do basically the same as for VDimm. You connect 1x 500K and 1x 50K potentiometers in series, and then solder them in between pin#10 and pin#4(VCC). That's all. Just like shown in the picture above.
Important info concerning VLDT:
VLDT is directly dependant on VChipset! That means VLDT can never exceed VChipset. For example for a VLDT of 1.5V you would need to set VChipset to at least 1.55V. And so on...
The higher you set VChipset, the higher the range of adjustable VLDT voltages.