PSU Doubt

hey. will a 500w psu actually suck full 500w from the power source or will it consume the amount the devices and stuff take up. for example if all the devices in the pc is 200 watts at the idle state, and 400 max, will the psu take 400w from the power source or 500w.
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  1. The second one. Except add in calculations for the power supply's efficiency as they are not 100% efficient. Power drawn at the wall will be more than the power the computer is using.
  2. no. im not talking about the efficiency. does the power input to the psu vary with the power the devices demand.
  3. nxym said:
    no. im not talking about the efficiency. does the power input to the psu vary with the power the devices demand.

    short answer yes your psu will only provide what is needed and draw waht is needed
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