Is 2GB RAM enough for a 64bit Windows 7?

http://www.walmart.com/ip/Acer-EL1352G-41w/15686810 I was looking at this computer. I want something cheap. And it has windows 7 64bit. 2GB RAM seams a bit low for 64bit. I'm a bit concerned I would have poor preformance on such little ram. So will it perform good or no?