Northwood core was better, runs cooler, and usualy performs better in most things at the same speed as a prescott. Prescotts do seem to overclock a little better, and once they get past 3.6hz, they start to perform better than a northwood, but they stopped them at 3.8ghz, because beyond they are having heat issues, and start to throttle themselves down. If you are refering to any Intel core, and not just desktop, then the Pentium-M Dothan core is the best Intel has. There are a couple of desktop boards that will support them now, and they seem to perform really well when overclocked.