Powersupply and paying bill

Hello,

I was wondering:

If I use a 500 watt powersupply and my components in total only use 400 watt.
Will the power supply draw 500 or 400 watt?

Thanks
8 answers Last reply
More about powersupply paying bill
  1. It will draw whatever is required. You have to have lots of components to draw 400 watts. At idle, your system will draw much less than 400 watts. Higher efficiency power supplies require less energy and therefore cost less to operate. What's more important is to use a power supply that's as efficient as possible for your power requirements.
  2. Ok thanks. I asked this because I do not need a extra heater element in my room =)
    But if it only draws so much energy as it requires to operate, then it's ok.
    :sol:
  3. Just be sure to get a unit that has a high efficiency rating (80+ rated preferably) - The efficiency rating is what determines how close to the actual power need the unit will draw from the outlet so a higher eficiency rated PSU will use less of an abundance of power that winds up being turned into extra heat.
  4. Grand!

    Ok 80% plus
    I have been looking and it seems these 2 brands are good:
    http://www.seasonic.com
    http://www.corsair.com

    Thanks again!
  5. Corsair and Seasonic are excellent choices.

    Corsair and Seasonic are two of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty.
  6. Yes. People are surprised at how little power PC's need.

    I like Corsair.
  7. But How can I safely measure and calculate my total watt used while playing a game?
    (during these moments the VGA card will require more power)

    Please tell! :bounce:
  8. turtlespeed said:
    But How can I safely measure and calculate my total watt used while playing a game?
    (during these moments the VGA card will require more power)

    Please tell! :bounce:

    It's already been mentioned
    http://www.newegg.com/Product/Product.aspx?Item=N82E16882715001&cm_re=kill_a_watt-_-82-715-001-_-Product
    Highest wattage witnessed, multiplied by the typical efficiency of your power supply will give you a general idea of power use.

    My system peaks at around 175w AC while surfing the net, average is around 150.
    175 watts AC
    x.84 typical efficiency of my psu
    147 watt load on the psu

    Not 100% accurate , but about as close as you'll get without spending big bucks for testing equipment.
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