G80 8800GTS OCP + VDROOP MOD - Made & Confirmed Working!

[Timbosan]

Hey, good work!
Did you notice any Vgpu change in 2D mode after soldering these 3 resistors?

PS The final scene of the Half-Life2 EpTwo is a very good OCP check! If you can try this with 1,52/1,50 V and OCP will not work - please tell us

Thanks mate. No there was no change in 2D voltage - i booted up and it was same as before the mod. I dont have HL2 on my PC, but i have gamed NFS Prostreet & crysis for 3 hours at 1.52/1.50v no probs. I can repeat (only tried 8 repeats so far) 3d03 nature, 05 & 06 with no problems. Also ran 1.57v/1.55v for about an hour no problems either.

fantastic work

how did you figure out what to do here

Thanks. Well working it out was a matter of working out which R/C components were involved in the Isen circuit, as the design differed from the G92 in that there is only one resistor paired with each cap in each phases Isen circuits. Soldering the resistors in parallel across the caps in theory should reduce the signal the primarion controller is seeing by a certain amount, depending on the value of the resistor used. The stock resistance across the cap was 1.29K so i didnt want to go much under 1.2k value so as to keep the signals still usable for the controller to keep current balance between the phases equal. I was initially going to use VR's adjusted to the same value but opted for SMD resistors. With the 1.2k smd's, its about a 51% reduction in signal,, which should be enough for some serious voltage.
I also have to thank Viper John, who helped me work out how the R/C circuit worked.

No wonder the PCB shot in 1st post looked familiar...
That's my pic from hipro's G80 OVP -thread.


edit:
I guess it's worth mentioning the removed resistor "70B" (replaced with "472") visible in the pic is not a part of this mod.

Yes i reappropriated your pic , i had no access to a camera till today. And yes, the removed 70B resistor replaced with the 4.7k is not a part of this mod.