Well, it depends what you want them for.
A Pentium M is basically a Pentium 3 mixed with a Pentium 4 - so it has latest features but a short pipeline. This makes it very good at unpredictable tasks, like gaming, but not so good at predictable ones, like video encoding.
The Athlon 64/Sempron have a slightly longer pipeline, meaning that they are good at games but good at everything else too.
The Pentium 4 has a very long pipeline, making it not so good at games but very good at video encoding.
The Pentium M also runs a lot cooler, it doesn't even need a fan on the heatsink. The downside is that their quite expensive, nearly £200 for a 2ghz one, and a good motherboard will cost you nearly £150. If you game a lot, want a quiet PC, or just want something different, their excellent.
Originally Posted by arrizx
Pent M. Take Any p.M speed and multipy it by 1.3, to get the equalviant speed of the p.4. If that makes any sence to you.. lol
No - your wrong.