On Tue, 3 May 2005 at 9:47am, Peter Farrow wrote > "based on the same x86_64 technology that AMD introduced with their Opterons." If you didn't top post, you wouldn't have to re-type my quote. > Not on planet earth I'm afraid.... Err, what are you talking about? EM64T (as an instruction set) is literally a clone of AMD64. Not a perfect one, of course, as there are differences. There are also differences in implementation, the most glaring of which being AMD's very smart move of putting the memory controller on the CPU and connecting the CPUs via HyperTransport. This leads to much better scaling vs. Intel's continued reliance on the bottleneck that is the shared memory controller hub. But the bottom line is that if you compile code for an x86_64 target (and don't put in any Intel or AMD specific optimizations), it'll run on either chip. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University