Demo,
Did your Inno3D card come with a stock voltage of 1.2v in both 2d/3d modes? Also do you remember what clockspeed your core was able to run at while still being stable before the voltage mod? Last but not least is 650Mhz the highest your card runs while still being stable @ the current voltage of 1.55v?

My card's GPU is still running at stock voltage (1.45v) but I have slightly modified the memory voltage which allows me to run at 860-870Mhz while still being stable. That is a good 80-100Mhz higher than it would run at stock voltages. I'm about to mod the GPU to run at 1.55v, I'm curious as to what I'll be able to run the core at after that mod while still being stable. Although I can currenlty run my core at 670Mhz it's more stable at 650Mhz and that is where I leave it for gaming and everyday use. I'll post back later today after the mod and let you guys know if it allowed my core any additional headroom.