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64bit guest virtual machines won’t power up

Tried to install a 64 bit Windows 2003 VM today, threw up an error when trying to power on the VM, turned out Intel-VT hadn’t been enabled in the BIOS of the ESX host which is required for 64 bit guest support.

Poor performance of virtual machines on VMware ESX

Had and issue today with virtual machines running on an ESX host. the VM’s were exhibiting poor performance and relatively high CPU usage even when doing very little.
Problem was eventually traced to Intel-VT not being enabled in the ESX host BIOS, as soon as the ESX host had Intel-VT enabled in the BIOS performance increased [...]