Hey pals
Nvidia GeForce 6600GT is clocked at the same core clock speed as the PCI Express version at 500MHz but its memory clock is slower at 900MHz compared to 1GHz. There is also no SLI support either. The AGP also needs an additional power connector because the AGP bus cannot supply the amount of power needed by this 6600GT card.
chek this link for more details:
*www.a1-electronics.net/Graphics_Cards/GeForce/2004/GeForce_6600-GT_Nov.shtml