On 02/24/11 9:18 PM, Ben wrote: > I have begun to switch all my hosts without hardware virtualization, so > can't use ESXi, to VirtualBox. ESXi only needs hardware virtualization support for 64bit guest VMs. as long as you can live with 32bit VMs, you're good with older CPUs. I have it running a dozen or more VMs on a quad Opteron 850 system (4 x single core 2.4Ghz)