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Thread: Pentium 4M or underclocking?

  1. #1
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    Pentium 4M or underclocking?

    Has anyone used a P4M in a mini-itx board that does not say it explicitly supports it? I know the Comells say they support it, but I would think other Intel chipsets should too.

    Or has anyone tried to underclock a desktop P4 to reduce heat and power consumption? My understanding is that the M chips are usually just the best silicon underclocked.

    I like the price/performance of the P4, but I want to use a smaller power supply (<= 100W) and reduce the heat. Any input is appreciated. Thanks.

  2. #2
    pip
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    You won't get as low on heat/power as a pentium M for the same performance by underclocking, but if you have a P4 already it may be worth seeing how far you can underclock and lower the voltage. You should be able to reduce the heat/power useage. However the PM & P4M are designed to run at reduced voltages so their performance will be much better for the same power/heat output.

  3. #3
    Raw Wave god_of_cpu's Avatar
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    I noticed very little heat or power gains by underclocking my anthlon from 1.4 to 1.0 Ghz. I'm currently running the anthlon @ 1.4Ghz on an mAtx motherboard w/ integrated GeForce and 7200 rpm hard drive as well as a bunch of USB devices and draw about 7 amps at max power usage, which is under 100 watts. Heat was a bigger issue but adding a more powerful fan fixed that easily.
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  4. #4
    pip
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    Did yopu reduce the voltage as well as underclock?

  5. #5
    Raw Wave god_of_cpu's Avatar
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    Quote Originally Posted by pip
    Did yopu reduce the voltage as well as underclock?
    Not all the clock / voltage settings allowed the computer to boot. I know I tried reducing the voltage, but I don't remember if it worked with the voltage reduced or not. I stopped trying different things after I put the bigger fan on and it stopped crashing cause of the heat.
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  6. #6
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    How about Athlon XP Mobile

    Around 40-45W for the XP2000-2400.

  7. #7
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    i just bought one from newegg, the 2400+ 45 watt for only $77. Should go nice with my shuttle sk41g.
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  8. #8
    pip
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    Quote Originally Posted by vcbb5
    i just bought one from newegg, the 2400+ 45 watt for only $77. Should go nice with my shuttle sk41g.
    I just got a 2600+ 45 watt for $99. I'm going with a standard ATX Asus m/b I already have and will custom mount it using a m/b tray/back panel to support the expansion cards. Just make sure you use a smaller heatsink to avoid damage to the m/b (more mass=more stress), I'm getting the following:


    Speeze low profile CPU cooler

  9. #9
    pip
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    I got the speeze low profile copper heatsink from Newegg. On the bench my Athlon-M 2600+ is running at 2ghz and 31C (at least according to the m/b).

    Seems to be cooling the CPU pretty effectively.

    http://www.newegg.com/app/ViewProduc...150-029&depa=0

  10. #10
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    Nice and cool there. Was going to do that myself but put in a 2400+ Desktop Chip instead. Though just wanted to add a tidbit here for those running the Desktop Chips and even for you mobile users (maybe). My processor was running 65C Plus. Since then I installed CPUIdle (http://www.cpuidle.de/). Now on a much hotter day and full sun, i ran video's for 30 Minutes plus and CPU Temp maxed on me at 55C. Big difference if you ask me. Worth a usage. And no, the WinXP manager does a lame job at keep cpu temps kool.

    mark

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