Mimmus wrote:
The problem is precisely this: booting RH AS 4 x86_64 from CD, it complains. I will indagate furtherly.
Than, the best thing would be to check which Xeon you have. Find out the sSpec number (should be printed on the processor, don't know if it can be read from software). When you know sSpec number, it is trivial to check on Intel's web site exact set of features your processor has.