http://www.theinquirer.net/?article=19495
"Mobile cores, AKA Pentium M. A quick look at the numbers shows that a 2 GHz Dothan scores 1528 SPECint 2000 (base) and 1087 SPECfp 2000 (Base). It confirms what we all know, PM is wholly competitive in Int, but lacks a little in FP. For a comparison, and Athlon 64 FX-53 at 2.4GHz scores 1623/1595 and a P4EE at 3.4GHz hits 1667/1578. Not bad company to be in, the PM can keep it's head up in this lofty crowd.
But a lot of things that the P4 is used for, from games to CAD need FP, and on that front, the PM it is a little lacking. Most of that lack is due to the memory subsystem and the FSB of the PM line, it is currently stuck at a 400MHz FSB and runs piddly DDR333 for memory. Can you say power savings over performance, or at least power savings over FP? Not many people want to run CAD on an airplane for 6 hours, but they may want to type. Overall, a good call, and it fits in 21Watts, about a fifth of it's competition.
Why is this a bright spot? Enter Alviso, the new PM chipset debuting in a January. This offers dual channel DDR2-533 support and a 533MHz FSB, along with other goodies like PCI-Express. How well does it do? Try 1685/1304 at 2133MHz. It looks like a 33% bus and memory bump halved the FP gap. It kind of makes you wonder what DDR2-667 would get you, much less DDR2-800, on a more modern FSB, like, say, the one they introduced last week in the 925XE. All of this can be yours for a mere 27Watts."