Okay, maybe a dumb question, but I tried searching Microsoft's website to determine the answer and was still unsure.

I am looking at building a new rig, but this time I want to use an AMD Athlon 64 X2 3800+ processor. I want to purchase a new copy of Windows XP (so I remain legal), however I am unsure if I have to go with Windows XP Pro x64 or if just a normal version of Windows XP Pro would suffice.

Do I get any benefits from going the x64 route?