Intel's recent release of their 64-bit supporting Pentium 4 6xx series processors has been a long time coming. With these processors, we've seen the desktop launch of Intel's EM64T Technology. MBReview has posted up an article detailing some of the core architecture modifications that have been made by Intel, ranging from registers to instructions. If you're interested in what's going on at the architecture level with these new 64-bit capable processors, be sure take a look!