Well, my situation is difficult because I bought my machine last year and still I'm waiting to get it... I live in Venezuela and merchandise here lasts A LOT to arrive. So, by last year, no one was even thinking about the 9xxx series cards, and I think the 8800 GTS 512 was the best choice back then (heck by now, is even one of the best choices still). If I had to buy now, I would wait till I see benches and prices from the 9xxx series...
I will leave both cards at 730 Mhz, but If I feel greedy on Crysis, I will overclock and see if there are some substantial gains at high settings (I don't even think of very high settings).
I got the Nforce 680 SLI Diamond from MSI, which has also a space for a probable PPU I would insert in the future, if its use is increasingly justified.
I will run my system using Vista because my major interest is to play DX10 games such as Crysis, WiC and UT3. I will then see by myself if my system gets many lags here. But if so, I'm doomed, cause I got no other choice (DX10 is only available on Vista)
Now, sure I'll post lots of pics, but I can't believe it, I've been told that I still have to wait approximately 3 weeks for my machine to arrive!!!!
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It's not easy to see how many new video cards are released, as well as new processors, and still I haven't been able to enjoy my system because of countrywide distance.
Take care.
Bandieramonte.