This P5 business is kinda funny, since the original Pentium's name was derived from the fact that it was the fifth major processor core design in the x86 family: (8086, 286, 386, 486 and then Penitum). So now we have the fifth version of the Pentium. It just has that "seventh son of a seventh son" sort of vibe. It would be funny if they actually wound up calling it the P^2 or something.