A question to those who knowJust putting this out there my Nivida card is 8800 GTS with 320 vidio memory, I have plenty of voltage and 32 amps on my rail, what do you think the short falls are with this card.
Next thing to consider: Does your computer case have room to hold those cards? Those #800/#900 cards from NVIDIA take up A LOT of room. Take a picture of the case open and I'm sure we can tell you.