I was wondering what kind of advantage a 64-bit processor gives you over a 32-bit processor. How much more performance does it give you? How much faster would a 64-bit 3.0+ GHz Intel Core 2 Quad give you over a 32-bit quad core model? Are any of the GPU makers developing 64-bit graphics cards? And does Windows XP recognize more than one CPU core? Or does only Vista do that?