Xen vs VMware

[walt]

Andreas Hauser wrote:
> dillon wrote @ Wed, 18 Oct 2006 11:34:02 -0700 (PDT):
> 
>>     Xen is an operating environment.  Operating systems running under Xen
>>     have to be aware that they are running under Xen.
> 
> Unless you use a current processor (Intel or Amd e.g.) which come with hardware
> virtualization...

Can you point out which processors have this hardware -- are they the
64-bit models only?  My instincts tell me that the 64-bit hardware
could virtualize a 32-bit machine -- but that's a pure guess on my part.