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Thread: Why does a carPC only use 120w power and a home pc need 450w??

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    Constant Bitrate munkynpunky's Avatar
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    Question Why does a carPC only use 120w power and a home pc need 450w??

    Hi,

    Yes i am a newbie and a noob, I've read about the OPUS power supply on the forums here but i still have a question.

    Why can i use an opus 120w 12v DC power supply on a computer in the car but i need a 450w 240w AC power supply for my home machine, they are both identical machines,
    MSI KT3V Motherboards
    AMD 2500 processor
    1024GB DDR Ram
    Nvidea MX4000 128MB DDR Graphics
    1 x DVD ROM
    1 x DVD-R/W

    the only different is my home unit has 2 x 200GB 3.5" SATA RAID HDD and the CarPC has 1 x 200GB 3.5" IDE HDD. Both have ..

    Would an Opus 120w power supply do the job or do i need to rethink my Car PC?
    Car is Dead, Hand is burnt - Let that be a lesson to me! never open the bonnet when you smell burning.

    http://www.digital-car.co.uk

  2. #2
    Variable Bitrate StrataG's Avatar
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    No way an Opus 120W would power that.

  3. #3
    Constant Bitrate munkynpunky's Avatar
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    ok, so i need to cut down my system then?

    For the opus to run do i need a special motherboard, and i restricted to processor size, memory etc etc?

    maybe just the DVD Rom - is the 200GB HDD ok?
    Car is Dead, Hand is burnt - Let that be a lesson to me! never open the bonnet when you smell burning.

    http://www.digital-car.co.uk

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    Variable Bitrate StrataG's Avatar
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    http://www.ohmygodmyarmfelloff.com/MP3Car/PSUpower.asp

    You need to be more worried about the load on the individual rails than the overall wattage your system needs.

  5. #5
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    Wiredwrx's Avatar
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    Quote Originally Posted by StrataG
    http://www.ohmygodmyarmfelloff.com/MP3Car/PSUpower.asp

    You need to be more worried about the load on the individual rails than the overall wattage your system needs.

    That is a great place to determine your power needs on a system, however, please note that they did not include the processor. You must determine the power requirement of your processor (through the manufacturers website, or a search. Then you must add it to the total you get from that calculator.

    To determine wattage of a device, Multiply the Amperage (amps. Note that 1000 milliamps is 1 amp, and all calculation must be done with an amp, so if it is less then an amp, make sure you put the "point" in the right place) times the Voltage (Volts. Again remember your math, and make sure you have the "point" in the right place if it is less then a volt, which is probably wont be, it will probably be 5 or 12 volts, though it could be 3.3)

    So,

    A 12 volt device, at 1 amp, is 12 Watts.
    a 12 volt decide at .5amps (500 milliamps) is 6 watts.

    Michael

    P.S. And it is not that you NEED 350 watts to power you computer at home, it's that you decided to buy a 350 watt PS to do the job, when something smaller MIGHT suffice.
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    Constant Bitrate munkynpunky's Avatar
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    Ok, Thank you for that link... its telling me i need "148.55 W"

    so now to start looking to see if opus do anything like this... may need to start looking at the ITX-Mini systems....
    Car is Dead, Hand is burnt - Let that be a lesson to me! never open the bonnet when you smell burning.

    http://www.digital-car.co.uk

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    Wiredwrx's Avatar
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    Quote Originally Posted by munkynpunky
    Ok, Thank you for that link... its telling me i need "148.55 W"

    so now to start looking to see if opus do anything like this... may need to start looking at the ITX-Mini systems....

    There are some higher wattage DC-DC PSs available, and more are in the works. Check out the MP3Car.com store, and Digitalww.com for a selection.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    Variable Bitrate StrataG's Avatar
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    Again, pretty much ignore total wattage. That does not equate to what will work and what won't. You need to make sure the amperage (or wattage since you seem obsessed with it) on each individual rail will be sufficient on the PSU to power your components.

    I could get a 1200watt PSU that supplies 99A on the 12V line, 1A on the 5V line, and 2A on the 3.3V line. This 1200watt PSU would not properly power a epia embedded setup, let alone a full blown power house.

  9. #9
    Constant Bitrate munkynpunky's Avatar
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    Quote Originally Posted by Wiredwrx
    There are some higher wattage DC-DC PSs available, and more are in the works. Check out the MP3Car.com store, and Digitalww.com for a selection.

    Michael
    Thank you, can anyone recommend any UK companies? I can find quite a few but just wondered if anyone can say good or bad?
    Car is Dead, Hand is burnt - Let that be a lesson to me! never open the bonnet when you smell burning.

    http://www.digital-car.co.uk

  10. #10
    Constant Bitrate munkynpunky's Avatar
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    Quote Originally Posted by StrataG
    Again, pretty much ignore total wattage. That does not equate to what will work and what won't. You need to make sure the amperage (or wattage since you seem obsessed with it) on each individual rail will be sufficient on the PSU to power your components.
    Hi,

    im only obsessed with wattage as i dont know any different, am i looking at this wrongly?
    Car is Dead, Hand is burnt - Let that be a lesson to me! never open the bonnet when you smell burning.

    http://www.digital-car.co.uk

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