to play farcry 64 bit , do you need xp64 installed?

[nirok]

to play farcry 64 bit , do you need xp64 installed?
basically i want to know if it is worth installing xp64bit, how much of a difference does it make? To play games in 64 bit do you have to have xp 64? cheers

 

[nirok]

cool thanks for the info, i still dont know if its worth putting xp64 on though, does it really make muich of a difference?