VMWare vSphere Hypervisor 5
Posted by essjae on September 2, 2011
I was excited to try out the new free version of ESXi 5 today on a test system with a Core 2 Quad Q6600.
I received an ominous message that “VMWare ESXi 5.0 installs on most systems but only systems on VMWare’s compatibility Guide are supported.” I didn’t think much of it until I got to the next stage of the install and got this message:
“Error(s) <CPU_CORES ERROR: This host has  cpu core(s) which is less than recommended  cpu cores>”
“(F9) Back (F11) Reboot”
Game over? Not quite. I found a post http://communities.vmware.com/message/1082035#1082035 with an almost identical hardware config referring to the same issue for ESX 3.
Disable MAX CPUid in the BIOS, installation completed.