We are experiencing a similar problem. We encountered the Q8200 chipset, 4GB on Window XP 64-bit, and we are running VMs in a VMWare Workstation environment. We are also running into problems with running multiple VMs. Not too sure if VT is the primary cause of this or if it is disk I/O.
Does anyone know whether VT or I/O is the major problem?
In comparison between ESX and Workstation and the Q8200 and a chip with VT. ESX seems to require VT. Whereas, we find similar performance in Workstation - with or without VT. Can anyone confirm this?