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Thread: What PSU for a P4 in a Mini-ITX factor system?

  1. #1
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    What PSU for a P4 in a Mini-ITX factor system?

    Hi all,

    My current Via MiniITX just doesn't cut it anymore, so I've located a P4 Mini ITX factor case - but am unsure about power consumption, so I don't know what kind of PSU to look at.

    This will have to run off car voltage (obviously), and be able to run a 2.4Ghz+ Celeron or P4 CPU + 1HDD.

    What have people used for P4 systems off 12v?

  2. #2
    Variable Bitrate NoPistonPC's Avatar
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    I have an EPIA P4-ITX w/ Celeron 2.4Ghz processor. I've had no problems with my Arise MPD-810 PSU. If you can keep it cool, it can put out around 120W of power. I like it because it is cheap ($79), it has good input voltage range (10V-30V), and has lots of juice on the 5V rail (14 amps) so I can power all my USB devices (I have 6 devices) and my 2.5" HDD without a problem.

    But, just to warn you, 10V is cutting it very close to the crank voltage, and many people have had problems surviving crank with this PSU. Luckily, my battery puts out more than 10V during crank, so I've had no problems.

    Also, I haven't tried with a P4, but I'm sure that if you get a Northwood based one, power won't be an issue.
    1994 RX-7, EPIA P4-ITX w/ Celeron 2.4 Ghz, Arise PSU, Xenarc 700TSV (new model)

  3. #3
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    Quote Originally Posted by NoPistonPC
    I have an EPIA P4-ITX w/ Celeron 2.4Ghz processor. I've had no problems with my Arise MPD-810 PSU. If you can keep it cool, it can put out around 120W of power. I like it because it is cheap ($79), it has good input voltage range (10V-30V), and has lots of juice on the 5V rail (14 amps) so I can power all my USB devices (I have 6 devices) and my 2.5" HDD without a problem.
    Hmmmm - interesting.. the 150W Opus PSU I got quoted on was $200US + $40US shipping. imho, unless I can get one cheaper, then it's not worth paying $350-400AU for a 150W power supply that I could make myself cheaper.

    But, just to warn you, 10V is cutting it very close to the crank voltage, and many people have had problems surviving crank with this PSU. Luckily, my battery puts out more than 10V during crank, so I've had no problems.
    This doesn't worry me - I have a dual battery system which disconnects from the main electrical system on cranking.

    Also, I haven't tried with a P4, but I'm sure that if you get a Northwood based one, power won't be an issue.
    Hmmmm - celeron would probably be ok... the GPS software works *way* too slow on a 533Mhz CPU - so 2.4Ghz Celeron should be fine...

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    oh, and btw - what kind of wattage does your system draw?

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    Variable Bitrate NoPistonPC's Avatar
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    I haven't measured current draw so I couldn't tell you the exact wattage. But, here is what I have on each rail:

    +12V: Celeron 2.4Ghz, CPU Fan (Intel), PSU Fan, SR-8187 slot-load DVD drive
    +5V: 2.5" HDD, 4-port USB hub, Audigy 2 NX USB, D-Link USB FM Radio, GPS receiver, XMPCR
    1994 RX-7, EPIA P4-ITX w/ Celeron 2.4 Ghz, Arise PSU, Xenarc 700TSV (new model)

  6. #6
    Variable Bitrate euro320i's Avatar
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    Quote Originally Posted by NoPistonPC
    I have an EPIA P4-ITX w/ Celeron 2.4Ghz processor. I've had no problems with my Arise MPD-810 PSU. If you can keep it cool, it can put out around 120W of power. I like it because it is cheap ($79), it has good input voltage range (10V-30V), and has lots of juice on the 5V rail (14 amps) so I can power all my USB devices (I have 6 devices) and my 2.5" HDD without a problem.

    But, just to warn you, 10V is cutting it very close to the crank voltage, and many people have had problems surviving crank with this PSU. Luckily, my battery puts out more than 10V during crank, so I've had no problems.

    Also, I haven't tried with a P4, but I'm sure that if you get a Northwood based one, power won't be an issue.
    HI, bought the same powersupply, it cost me almost 120 with the cable harnmess. It works well, when you figure out where all "extra" connectors ar supposed to be connected. I thought it could be a little smaller. But quality is really top notch. It gets really hot though, so I added cooling to it.
    How do you get around the cooling issues, the manual says 80W w/o cooling, 120 watts with cooling. It got it from www.bicker.de.


    o/______\o
    (oo_OO_oo)
    []o-----------o[]
    '94 320i


  7. #7
    Variable Bitrate NoPistonPC's Avatar
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    I just took an old case fan from one of my other machines (they are like $5 new) and plugged it into one of the molex connectors coming out of the PSU. The fan had a built in molex splitter so it didn't use up any of the connectors. So basically, the PSU powers its own cooling system.

    It doesn't take much to cool down that PSU since the PSU case is a massive heatsink that cools down quickly with even the smallest breeze.
    1994 RX-7, EPIA P4-ITX w/ Celeron 2.4 Ghz, Arise PSU, Xenarc 700TSV (new model)

  8. #8
    Variable Bitrate euro320i's Avatar
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    Do you have a P4 setup? Do you have 3.5in HD and a full size DVD-Rom? I was wondering if it had enough juice to support a full size system.

    o/______\o
    (oo_OO_oo)
    []o-----------o[]
    '94 320i


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    http://www.cartft.com/shop/catalog/il/407

    ...i'm surprised no one posted that one

  10. #10
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    Quote Originally Posted by niral622
    http://www.cartft.com/shop/catalog/il/407

    ...i'm surprised no one posted that one
    I have to say, GOD DAMN!... But for the benefit of people on the other side of the planet, what the hell is a Euro worth?

    I wonder if there are any places that have these and take $AUD...

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