I would go with the Dual Xeon in this case it'll simply be better at multi tasking and that's what most servers do. THe AMD has more power on a single process but simply isn't looking great when you have numerous processes running.
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Yeah, I've noticed in 64-bit OS'es that the AMD gives everything it's got to the process that is in use, meaning all the rest are practically suffocating. It's good in 32-bit OS'es when it comes to multitasking, but the dual Xeons would work even better. (I use an AMD Athlon64 3400+ in my desktop.)
One thing I've noticed in benchmarks, though, is that dual processors actually score lower, because it takes longer to transfer the input and output between the two processors than it does to run it through one. Other than that, Dual Xeon all the way.
That doesn't mean it is the correct choice. If you don't need the full power of a dual Xeon, and then with the price difference between a dual Xeon vs. an Athlon64, the Athlon may be the best choice, although it is not the fastest processor.
Originally posted by artin1982 KarlZimmer
he asked about performance not price
Correct, which is why I answered the question saying the Xeon was faster. I then went on to say, as is always the case, the fastest server isn't always the best choice. Even a rich person shouldn't be wasting money, even it is only $50 a month, waste is waste.