ECS nForce4-A939 Voltmods

Author: celemine
Date: 2006-05-11 17:25:27

VChipset

Datasheet of the RT9218 controller:

http://www.richtek.com/www_en/Docs/DS9218A-03P.pdf



Take a 5K potentiometer and a 500R potentiometer and connect them in series. Finally connect those potentiometers between pin#12(FB) and Ground/GND(pin#3), just like marked in in the pic.

VChipset & VLDT Measure



VDroop



This mod is used to adjust the VCore output while in idle and load until you (nearly) get a exact match. That means the lower the difference between load and idle volts, the better.
The 3 Droop-resistors are marked with RED squares. Those 3 resistors that all have the same value of 39K (marking of "393" on top) need to be exchanged for 3 equal, higher rated resistors. I used three 47K resistors (~20% increase in comparison to the default 39K), because I still had them lying around. With my CPU set to 2.6GHz, at a VCore of 1.6V, I got a Droop of ~0.009V (measured 1.648-1.657V), which I'd consider quite acceptable. Each system behaves a bit different, so you could experiment with higher or lower rated resistors to get the best effect for your individual mainboard.

Perhaps I'll add a VTT-mod if I find the time to. I actually measured VTT under load and it didn't look like it was really necessary to do the mod, but you never know. Perhaps it could help some of you.

Finished! These are all the mods that I discovered for this board. If you have any additional questions or perhaps even some additions to these mod-descritions or ideas about the modifications, then feel free to visit our discussion forums.

Warning:
All modifications are done at your own risk! I am not responsible for any damage caused by the modifications described above! Any hardware modification will definitely void your warranty! Keep that in mind.

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