I'd suggest looking at Tomhardware CPU charts - But they seem to be down (at least for me) :?
I would look at this article too:http://www.tomshardware.com/2005/05/25/dothan_over_netburst/
It compares the Dothan (Pentium M) chip to the Pentium 4 and Athlon processors. They talk about the old PIIIs in this article and how good they were.
As early as 2000, THG observed that the Pentium 4's performance was clearly inferior to that of its predecessor, the Pentium III, on a clock-for-clock basis. On the other hand, the newer design had one undeniable advantage: it could reach much higher clock speeds. This was the weakness of the Pentium III design, which hit a clock speed barrier as a result of thermal problems - a fact that THG helped uncover. More information about the Pentium III's thermal problems can be found in this article Intel Admits Problems With Pentium III 1.13 GHz: Production and Shipments Halted .