I'm prety sure the AMD's fx-51's aren't only 32-bit compatible, but their fastest 32-bit computing solution with 64-bit computing as well. Everyone's read it's features by now I hope. The only processor that outperforms this in gaming, stock no OC's, is the P4EE which Intel released after the fx-51. In the benchmarks I've read the apple g5 isn't much of a gaming or performance system but more of a quality system with the exception that it takes HALF the time to do prety much anything sound related than both the P4EE or the fx-51. [URL=http://www.maximumpc.com[/URL] is a magazine I read form time to time. Also if your serious about gaming, this site may become your bible, you might want to look into a faster hard drive and faster ram bu ttry and keep it all in prospective. If you get pc2100 ram then you don't really have the need for an on-chip memorry controller that the fx-51 boasts. However if you have a bit of cash and don't mind spending it then the faster your computer is the less lag will be gamewide since your system, and hopefully your internet conenction, can take the abuse games will give. The fx-51 was aimed to be a PC processor more than a server solution, the opteron is the AMD equivlant to 64-bit server processing.
The P4 isn't far behind at all, it even outperforms the fx-51 in some system configurations. You'd have to check the site for details if they publicly post their articles online. Manufacture sites may say different to benchmarks but since most all benchmarks give the same result with real world systems and not the manufacturer guine pigs.
I don't know how Intel's "prescot" is comming along, but Intel has said in the past they they don't think "consumers" are ready for 64-bit processing. And why not? Maybe it's Intel that isn't ready.
I had another post but I've recently bought a logitech mx700 and it has back and forward browser buttons. I hit the back button...