I Have successfully made the OCP mod for the 8800GTS (G80). What you do is solder 1.2K SMD resistors across the 3 caps i have outlined in pink. The stock resistance across the caps was 1.29k and with the 1.2k SMD resistors on it is reduced to 0.61k. This reduces the OCP signal by 51%. I also realised during testing that it also reduces vdroop from ~0.08v to 0.02v under load. I successfully ran bench after bench @ 1.52v idle, 1.50v load. You will need to improve cooling though, i have a modded heatsink & fan and it still hit 93*C during repeated runs of 3dmark05 GT2 but it was totally stable. I was able to bench stable at 702MHz gpu, the previous max was 684, and theres more left in it.
No photos yet i had no camera
EDIT: pic 1 edited to show values. NB: replaced 70B is not part of the OCP mod.
EDIT - PICS OF MOD ADDED. Please excuse my soldering im not using a fine tipped iron and those smd's are tiny
EDIT: The vdroop is 0.02v, but for most of the time it is only is 0.01v