Tom's Hardware > Forum > Mobile Computing > General Mobile Computing > what's the difference?
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BigRat   10-30-2003 at 05:18:57 AM

can someone tell me what's the difference between a mobile P4 and a mobile P4-M?

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RaPTuRe   10-30-2003 at 06:40:12 PM
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Nothing.

The P4-m is merely a P4 (400MHz FSB) with the SpeedStep circuitry enabled so that it can step between 1.2GHz and its default clock speed.

RaPTuRe

Who's General Failure and why's he reading my disk?

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BigRat   10-31-2003 at 02:29:43 AM
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so the mobile P4 operates at full capacity all the time? then what qualifies it as a mobile processor? the battery probably wouldn't last an hour if it runs full speed.
Thanks for the reply.

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papasmurf   10-31-2003 at 03:03:52 AM
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the p4m has speed step enabled and runs at a lower voltage than the standard desktop p4s but be warned, it still sucks a significant ammount of power. Don't expect great battery life!

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RaPTuRe   10-31-2003 at 05:56:27 AM
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No, the P4-m runs at a lower voltage (so it actuall lasts quite a bit longer than that anyway), and if you do not set it to run at maximum performance, it will step down to it's speedstepped speed. Then virtually instantly it goes into DeeperSleep (as intel say) "between keystrokes" which drops the voltage for a brief instant to less than a volt. If you want it to run at full speed, it runs at full speed, if you want better battery life, it will SpeedStep when not at full battery life (or you can set it to run in SpeedStepped mode all the time). All this said, the battery life on P4-m based systems is still not the best.

RaPTuRe

Who's General Failure and why's he reading my disk?

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BigRat   11-01-2003 at 01:54:45 AM
- 0 +

i see. thanks for the clarification

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