The Pentium-M architecture is quite different from that of a normal P4-Mobile. You might scoff at 1.6ghz, but that little processor is probably quite able to outperform a Pentium 2.4 or even higher depending on what you're doing.
It's the same basic instruction-per-clock as a Pentium 3 desktop, combined with the quad-pumped bus and double-pumped ALU from a Pentium 4. But rather than being a wierd combo, it also brings
significantly lower thermal ratings and power draw and also has a built-from-the-ground-up adjustable clockrate. None of the cheap Intel Speedstep "Half clock or Full clock", rather there are TONS of intermediary clockrates available from the full 1.6ghz all the way down to 250mhz.
Right now I'm typing to you on a Thinkpad R50 powered by a 1.6M; it's been running wirelessly for the last two and a half hours and is still reporting 63% of it's battery life available. With 512mb of ram, a 30gb disk, running the built-in wireless and keeping the display active, you start to get the idea how these puppies can really save you some battery life...
If you already have a gaming rig, then get a good Centrino Technology laptop that comes with the Pentium-M processor and the built-in wireless. Get a decent video option like the 9600 mobile, and you'll be able to work OR game anywhere you like.
I've used this laptop to watch two entire DVD's (Schindlers List being one of them) and still have battery left to surf for half an hour. It really is that good
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