Opinions AMD64 vs EM64T vs Itanium II

Hi folks,

	we are in the process of buying some blades for our HP blade
center to use for Linux servers. Since we are starting fresh, and I have
no practical experience with Linux on 64-bit, I figured I would ask for
input from the Taroon and Nahant list.

Are there any technical reasons to prefer AMD64 (Opteron), EM64T (Xeon)
or Itanium II CPUs? Are there things that don't work in RedHat on any of
those platforms with either RHEL3 or RHEL4? 

Beyond that, we are currently running 32-bit on 32bit Xeon processors -
I'm think I can also run 32-bit RedHat on either the AMD64 or EM64T
chips - is that correct?

I appreciate any comments.

Thanks,

Kevin

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