I have the 512GB version, which I had that version as the memory is clocked MUCH higher (2.1GHz opposed to 1650GHz) and it's DDR4 memory opposed to DDR3. Honestly that much Ram I think is overkill the fact that it's clocked so much higher will posse very nice advantages with higher resolutions and higher AA as the HD 2900XT supports 24x AA while no other card on the market can support AA that high.
You can still stay with the 680i series motherboard, although beware, you cannot crossfire with it, if you ever plan on doing so.
If you want the best of the best, stick with the GTX, if you want to save a fair amount of money, the HD2900XT beats the 8800GTS in pretty well every game and it beats the GTX in 3 games. With ever new driver release comes better performance. The AA issue we used to have was cleared up last week with the new catalyst 7.7 release so when you read reviews about the card you can now ignore this statment. Apperently the HD 2900XT never "supported" AA till that moment.
All in all, I recommend the HD2900XT (512 version) if you want to save on a little cash, otherwise if you want to get the best of the best go stick with the GTX. As ruthandtroy has already mentioned, if you take the HD2900XT I recommend the P35, if you get the GTX then I recommend you go for the 680i chipset.http://www.newegg.co...N82E16814102095
One last note, if you overclock this thing, you will surpase the GTX in many games and have paid much less, however you need a high quality PSU to do so. So if you do get decide to get the card, please tell me how much money you can spend on a PSU and I'll find you one that'll alow you to overclock it achieve GTX performance and greater (however not in all games). You'll probably be looking at 150-170$, an investment in you PSU will allow you to achieve greater potential.
Edited by james_8970, 27 July 2007 - 10:05 AM.