Confirmed Working :
HP Z600
2 x Quad Core E5530 (HT ENABLED)
24GiB ECC RAM
Intel 5520 Chipset
Nvidia Quadro FX3500
1 x Broadcom BCM5764
1 x BCM5761
All SATA Ports (With SATA MODE SET TO IDE)
So far so good - will report some further experiments with PCI Pass-through laters -
It supports EPT - Extended Page Tables for nested virtualization for 64Bit
Hope this helps someone - thanks