you can go to 2.8ghz for the venice 3200. some websites showed this improvement over the winchester 3200, which was only 2600 max. you can go to 2.8ghz on venice 3200 with a increase of voltage, but not to a crazy amount, just a moderate increase.
dont bother comparing intel pentium 4s to amd 64s in games. pentium 4s get huge drops in fps but not amd 64. but the pentium m is a different store, it is just as good as amd 64 for games, pentium m arcitecture is the future of intel cpus.