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Thread: PC Electricity Consumption?

  1. #1
    worldpease's Avatar always annoying
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    how many watts does a PC use?
    for example by hour,...
    how many watts does it use by hour, when I leave it on by night?
    (considering that is just the CPU unit, not the monitos).

  2. Software & Hardware   -   #2
    uNz[i]'s Avatar Out of order
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    Here is a list of PC parts with how many watts each part uses.

    Edit: It's a bit of an old list though... but it'll still give you a general idea.
    Last edited by uNz[i]; 02-11-2005 at 09:46 AM.

  3. Software & Hardware   -   #3
    lynx's Avatar .
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    Nice list.

    Remember that most of those are PEAK power consumption figures, generally the use will be a fraction of what is quoted there.
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    Political correctness is based on the principle that it's possible to pick up a turd by the clean end.

  4. Software & Hardware   -   #4
    worldpease's Avatar always annoying
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    Here at home,
    they blame the high bill rates on me, they say Im the one with the computer, and that I leave it all night... but I don't think so, the CPU can't take more energy than the freaking lights that no one turns off, the washing machine that they forget to turn off, or the 25" to 27" TVs that are on at least 8hrs a day.
    I guss I'll just have to pay the bill and see if they leave me alone for once.

  5. Software & Hardware   -   #5
    tesco's Avatar woowoo
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    lets jsut say my computer was to work at full power consumption for 24hours a day, 7days a week for 1 month.
    450watts(psu)+35watts(monitor)=485watts
    485/1000=.485kw
    at 5cents/kw electricity that would be:
    .485*5=2.4cents/hour
    2.4cents*24hours=57.6cents per day
    57.6cents*30days=1728cents (17.28dollars)

    so to leave teh computer on 24/7 it would cost ~17dollars per month!

    now i most likely did something wrong here but oh well.
    Last edited by tesco; 02-11-2005 at 09:38 PM.

  6. Software & Hardware   -   #6
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    Ross.

    The 450 watts rating of a power supply is the total output. Not it's consumption.

  7. Software & Hardware   -   #7
    tesco's Avatar woowoo
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    Quote Originally Posted by Virtualbody1234
    Ross.

    The 450 watts rating of a power supply is the total output. Not it's consumption.
    oh.
    so what does it consume then?

    edit: did i get the other part though? like would the 450watts be watts used in each hour or something else?
    Last edited by tesco; 02-12-2005 at 12:16 AM.

  8. Software & Hardware   -   #8
    lynx's Avatar .
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    The PSU is probably about 80% efficient, so the total consumption should be about 600W not 485W. Other than that your calculations are correct, you just need to increase the figure by about 25%, making the total (based on 5c/KWh) about $21.50 per month.

    Of course, you wouldn't actually run so close to the PSU's maximum capabilities and in any case you could never run every component at full power 24/7. So you could probably make a guess at the actual consumption being about a quarter of that, or about $5.50 per month.
    .
    Political correctness is based on the principle that it's possible to pick up a turd by the clean end.

  9. Software & Hardware   -   #9
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    Consumption is what is drawn from the wall outlet. Not the output of a power supply.

    I did a small test. I hooked up an Amprobe similar to this:



    With my PC running at idle it shows a draw of 1/3 of an amp.
    Under load (Folding@home) it shows a draw of 1/2 of an amp.

    And I'm being generous. It shows actually less than these figures.

    120 volt line @ 1/2 an amp = 60 Watts.

    So in fact my PC is running under full load and the consumption is less than 60 watts (not including monitor).


    So... 60w x 24h x 30d = 43200wh

    43200wh / 1000 = 43.2 kwh

    @ 5 per kwh that's:

    $2.16 per month or $25.92 per year.

  10. Software & Hardware   -   #10
    worldpease's Avatar always annoying
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    Damn, you guys are good.
    I don't think it makes diference, they just won't "see".

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