I have the 4300u in my SP2 so this isn't a 4200 vs 4300 thread. I'm just wondering if even though the CPU is VT-d capable, is it allowed for in the BIOS, etc? Does it need to be enabled? I'm using Hyper-V for virtualization and wondering if the 4300 is using the extra virtualization features? I know VMware Workstation is a type-2 hypervisor so it doesn't likely make use of it in any case. Would any of the others make use of VT-d?