VMware Hardware MMU Info
Interesting paper on the nehalem MMU stuff:
http://www.vmware.com/pdf/Perf_ESX_Intel-EPT-eval.pdf
By comparison here’s the tests on AMD hardware:
http://www.vmware.com/pdf/RVI_performance.pdf
Summary, some things AMD is a little faster on; Intel is consistently a little faster on a few more tasks though.
All in all though the difference appears minimal.