Would my CPU be the Bottleneck??

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Im am going to hold out until November till upgrading my system, and maybe see how Crysis runs on my current system. My system at the moment is,

Win XP MCE
Asus A8N-SLI mobo
AMD 64 X2 4800+
3GB DDR PC3200 400mhz
Nvidia 7900 GTX 512MB

If i was to just purchased a 8800 GTX card would this cause any of my other components to be bottlenecks? And would i see a large leap in performance with just changing the card

 

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So are we likely to see happen november time, the 8850 or 8900??

 

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Ok, thanks for your help