This actually depends on the processor. Check the following URL for information about your processor features:
It does support Intel® Virtualization Technology (VT-x)
If you think @ VMware Products the K processors don't support all VT's the Intel® Virtualization Technology (Intel® VT) for Directed I/O (Intel® VT-d) isn't supported and you loose a VIP part of new virtualization, i'm looking for VMWare products and Sandy Bridge CPU too and my choise, actually not yet tested because must buy is: P67 and i7 2600 any GPU for ESXi 4.1 server role, if ESXi fail then i think to move my first Workstation under in Sandy Bridge Seven x64 VmWare Workstation 7.x and a pair of latests Nvidia's 2000 GPU in SLI to have VTd too and use original X58 workstation for ESXi role.
Regard sorry for my English