why 64b CPU cannot play game?

They are much faster than the 32 bits CPU. We have built a Athlon 64 bit 3200+ CPU with GF 9800 Pro display to play Far Cry and the result is excellent in compare to P4 3.2E with the same display card.
In addition, when you click links in IE, the new page is jump out instantly with almost no delay. Very impressive.
I used to be Intel's fan when I was a programmer for five years. After I saw the performance of the new CPU, I switch my mind. I only believe what I saw.