Quote Originally Posted by T_M View Post
Measuring the resistance across the resistor prior to the mod (or to ground) i get 3.xxk ohms. Adding the 100K with it at max resistance i get 9x.xxk Ohms. Then by reducing the VR it drops down, until i hit 7.xxk then it suddenly trips over to 3.xxk.


by default - as the VGA is - it's resistor IS 5.2K.....How do you measure by default 3.xxK.......?.....


Some updates:

A friend of mine did the OVP Mod on his 8800GTX VGA....Though he got a bit more overclockability out of it (he gained some more MHz out of the Core), the "powering down" still exists.....
I asked him to measure the Vdroop of it......From 1.61V it went down to 1.54V during bench....
SO I think that this is the cause to work properly the OVP Mod.....One resistor is the "start up" voltage and the other resistors "tracks" the "spikes" during runing.....So if a "spike" of Core Voltage is high, the VGA powers down.....
During Vdroop (running a 3D), the VGPU NOT only goes down BUT produces HIGH "spikes" as well during a "relaxed scene" of the 3D.....
That's the reason that it worked perfect for me......
I only have "freezings" when my VGA can't go higher.......NO power down.....During a freezing at 1.75V (idle), I STILL measure 1.72V (load).....NO power down......Maybe coz of the "extra" components I have added on it for less Vdroop....
I'll check it out.....