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Quick Simple Question about PSU

By RickyEaton
Apr 14, 2006
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  1. I live in the UK and switched my PSU while plug was in on the back from 215V to 115V and it went :hotbounce why was this. (yes i hardly know anything about computers)

    Question TWO: Also i would like to know how i could turn the power down without this happening.

    Question Three: i am building my own computer and came across a brilliant PSU but it is 580W and i will only need about 320W so can i turn this down (if i can how can i do it without blowing up my computer lol) and also if i cant will using it destroy my motherboard because of being overpowered.

    THANX A LOT
  2. Peddant

    Peddant Newcomer, in training Posts: 1,644

    1.The input power and output power have no connection with each other.

    2.You CANNOT alter the output by varying the input.A PSU will only supply
    the power demanded by the components of the PC.

    3.If you live in the UK,you MUST use the 215 volts input setting at ALL times.
    Otherwise...well you know the result.

    4.The power rating in Watts is the maximum power that can be supplied.There is no minimum.

    5.A 580W PSU will happily power a 320 W system.The only slight issue is that bigger PSUs
    produce slightly more heat,so it`s generally better to use one nearest the spec of your PC.
    Not a major problem though.
  3. RickyEaton

    RickyEaton Newcomer, in training Topic Starter

    One Last Thing

    Thank you for your help very much appreciated.
    But what do you mean by the input and output in the PSU i thought there was only an input (electricity)
    Thanx
  4. RickyEaton

    RickyEaton Newcomer, in training Topic Starter

    ALSO (lol)

    if i get a 580W power supply with a 3xxW needed will there be any waste energy.
  5. Peddant

    Peddant Newcomer, in training Posts: 1,644

    I think we might need some heavy duty schooling here :) PSUs explained

    You plug your computer into the wall.The wire goes into the PSU of the computer.That`s the input.

    The energy waste is very marginal.
  6. RickyEaton

    RickyEaton Newcomer, in training Topic Starter

    thank you

    dont quite get all of it but i will keep rereadding it until i do.i get most of it however. thank you very useful
  7. SOcRatEs

    SOcRatEs TechSpot Paladin Posts: 1,382

    Hello! Welcome to TechSpot!

    Psu's convert/rectify power (electricity) from 115v ac {US} & 215v ac {EU} to
    12v, 5v & 3v Dc.
    As Peddant states above a system requiring only 320 w psu, can be run by a 580W
    psu no energy waste. Systems will only draw what they need durring use,
    on an "on demand" basis. It doesn't cook it up in advance and wait for uses.

    Any way, you'll be needing a psu then?

    G'Luck
  8. RickyEaton

    RickyEaton Newcomer, in training Topic Starter

    thanj you

    thank you for all your help i now understand. cheers
  9. HughJass

    HughJass Newcomer, in training Posts: 137

    if u want to use less power, get a processor that has a lower ghz rating
  10. CrossFire851

    CrossFire851 Newcomer, in training Posts: 1,058


    Not nessacerly.

    It depends on the make and model of the cpu.
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