CPU utilization is pegged at 100% when using <4 vCPUs (in any conifguration, however Windows 7 Enterprise only recognizes 2 sockets)
Kernel time is nearly identical to CPU utilization much of the time, generally within a few percentage points.
This renders the domU unusable in performance terms.
All XS Patches available and updated XenTools have been installed in guest VM. Guest VM had tools upgraded from 6.2; XenServer tested with both complete fresh install and upgrade from 6.2 - same results.