32bit or 64bit?

[~The~King~]

good day,

i require some help regarding to working out if my future machine will be 32bit or 64bit..

as i intend to be buying vista soon.....

i intend to be buying the following MB

ASUS Striker Extreme Republic of Gamers Series - motherboard - ATX - nForce 680i SLI

and cant work out if its 32 or 64..

any help regarding this would be greatly appreiciated

thanks