Pentium 4 1.4 Ghz? Intel poopoos? (Score 1)

Can anyone confirm how we know for sure that the Pentium 4 core clock really runs at 1.4Ghz/1.5Ghz and it's not just a marketing numbers game? Does anyone outside of Intel actually do / know how to do tests to verify these numbers? Given that it's a completely new architecture, surely it's easy to stick 1.4Ghz on the bottom-end chip and then get away with pumping up the Ghz over the next few years.