Lots of good replies... here's a couple that didn't make the exploder:
The Core i7 is next-in-line after Core 2 Duo.
Therefore, Core i7 is a safe bet, and the OCUS scores validate such.
Although PTC is slowly implementing/improving multi-thread support in
Pro/E, you don't have to worry about how or when.
The reason that the Core series CPU's are so fast is because they can
apply multiple cores on a single thread.
I still do not understand how this is achieved, but it was confirmed in
our own tests (of Core 2 Duo) using the OCUS benchmark.
Last year I got some Dells with i7s with 32 bit OS. They run Pro/E
faster than the core 2 duos that I got the year before. It was a
noticeable difference. On Olaf's benchmark my Dell is 10th on the
regular list and I ran it back in May '09. My time was >30% faster with
<10% increase in CPU speed. I think the biggest boost came in the speed
of the RAM, which was 1333mhz on the new machine.
We just had an AE from PTC here last week. Multi-threaded isn't all the
way though pro even in 6. 5 has it in a few more places, the file
retrieve, regen, and I think there was some other obscure corner case
where it was used.
As for the i7, I'm guessing the high benchmark has more to do with the
fact the i7 chip can overclock on the fly. The 64 bit really only
allows more ram, so you can open bigger models