So what exactly is this volt-mod that can be applied to the GT's?=). I would assume its a hardware modification involving switching some of the resistance on the + volts line of the core , but im in unfamiliar territory where this is concerned so i'd need to do my homework before i attempted anything. Know of any good web resources with volt-mod information? Also, i asked earlier but i didnt get a clear response, so what is the main difference between 6600GT and 6600?? Is it a mere matter of MHZ? or is it more along the lines of different cores?