500W power suppplyy for my rig

heres my rig:

4870 512mb

X3 720

640GB

4GB RAM

Thats my rig so will 500W be enough to support it.

im not sure about this but get a 700W PSU just to be safe

but if you want to be sure , maybe this can help you out, check it out :)

http://extreme.outervision.com/psucalculatorlite.jsp

It depends on the PSU, this would work: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004 Cheers