just bought a uMBP, need window for games, which one ?

[10-Dee-Q]

so i guess this has been asked hundreds of time before, but when i looked at those thread there are no definite answer yet , so here i go

i just bough uMBP 15" 2.66mhz with nvidia 9600GT 256MB

and im planning to use boot camp+ window to play games, like NBA live2K10, pro evolution soccer and such.

now, ive research abit and found its better for me to use window 7.
the question is , which version? 32 bit or 64 bit ?
i have 4gb of ram if that matter.

can somebody tell me the pro and con of both ?
thank you very much.

 

[flopticalcube]

x64. It takes a little bit more RAM and disk space but makes use of all 4GB of RAM and runs a bit faster.