Well I have done the GPU Vmod and it works but has no effect on my overclock

I used the little solder pad to the side of the IC's leg which is alot easier to solder to.




480 Ohms gave me 1.5090 V
475 Ohms gave me 1.5210 V
469 Ohms gave me 1.539 V

Yet my card will not overclock further than it did before at any settings, infact it actualy seems less stable with large texture sections in 3dMark 05 turning green at 590 Mhz with 1.539V yet with no volt mod they hardly ever apear.

What is affecting it ?