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How to enable 64-bit in BIOS on HP serverTo be able to run 64-bit VM's in VMware ESX server, then
Intel-VT technology needs to be enable in BIOS. Furthermore, to
enable EVC (Enhanced VMotion Compability), No-execute memory feature should be enabled, see below.
1. Go to BIOS (press F9 during boot)
2. Go to Advanced Options -> Processor Options -> Intel ® Virtualization Technology
3. Choose Enable
4. Furtermore, to enable VMware EVC, enable 'No-Execute Memory Protection' (just above Intel-VT).
5. Save and exit
NB: All hosts in your cluster should have the same BIOS settings. If not, this can result in VMotion issues.
แหล่งที่มา : http://www.vi-tips.com/2009/04/how-to-enable-64-bit-in-bios-on-hp.html