How is my PC gaming build?

Be careful with the RAM 1600 is the overclocked speed, you will have to change it from 1333 to 1600 in your bios. Otherwise this looks like a great computer. If you are into core-unlocking and overclocking you can bet a faster CPU for much less money, since your mobo supports core unlocking you might want too look at the phemon II x2 555 which can become a 4 core processor.