Opterons are about 140-150%+ as fast as the same number of Xeons; but they cost about that much more. Itaniums pump up the spot above that but I never said that Opterons weren't the fastest on that list. Anything up to 8 Processors and an Opteron will match an Itanium, the advantage of an Itanium is that they do 128-Processor Superdromes of them that Opterons don't fit in with.
Well that was of course a joke; but it certainly does prove that the EM64T is a 64-bit Processor. Haha, other than Tea, Biscuits and Lemonade - I neither drink nor eat anything for fun.