According to AMD's website it requires 125 wattshttp://products.amd.com/en-us/DesktopCPUDetail.aspx?id=726
However its usually the graphics card that requires the most power. Usually for a single card, and a CPU a good 500w+ PSU is enough. This obviously depends on what graphics card you will be using though, if any at all.
Alternativly, check out this PSU calculator:http://extreme.outervision.com/psucalculatorlite.jsp