Re: Mining rig extraordinaire - the Trenton BPX6806 18-slot PCIe backplane [PICS]
It's possible that XenServer might work, but as far as I know the hardware virtualization requires an expensive license to use, and using open source Xen would be Greek all over again. 
For the record, XenServer, isn't a product I'd recommend for most purposes due to my not being too fond of the company that makes it.
Xen, by contrast, is open source -- it doesn't cost anything; that includes the hardware virtualization support. In other words, it just so happens that XenServer uses Xen as part (most) of its "commercial product," but there's no reason regular people who don't hate money can't use it also, for free
