hi there, i'm building a new machine and i'm not sure if i should get the Athlon 64 4000+ 2.4 ghz L2 1mb or the Athlon dual core 4200+ / 2.2 GHz L2 1 MB. can you play games on the dual core as good as you can on the 64? is the dual core at 2.2ghz faster than a 64 at 2.4ghz?