Well, I don't have any links to corroborate what I'm going to say, but the P-M is simply a highly modified Pentium III, but for all it's enhancements, it retains the same 10-stage pipeline. The Turion, as mentioned above, is more or less a low voltage socket 754 A64, with a 12-stage pipeline. Clock for clock, the P-M should be the more efficient processor, the difference is most likely slight though.