Quad/Octo core: How many watts are Actually used?

Discussion in 'Mac Pro' started by SLT, Jan 16, 2008.

  1. SLT macrumors newbie

    Joined:
    Jan 16, 2008
    #1
    I’m still undecided whether to get the Mac Pro with one or two 2.8 GHz processors. One of the factors I take into account is how many watts the machines use. The TDP of these processors is 80 Watt. Two processors would make a maximum of 160 Watts.
    But lets say that at a certain point in time, I would be reading my email only. Not a processor intensive task at all. How many watts would be used then, when you would compare the dual processor to the single processor? Would the processor-part of a dual processor Mac use twice as much electricity, because two Xeons sit in it? Or would it be less, because the task I’m performing is not processor intensive?
    Could someone please shed a light on this?
     
  2. newtech macrumors 6502

    Joined:
    Jun 2, 2007
    #2
    TDP is the design target HEAT output, actual power consumption is higher as not all the consumed power is directly converted to heat.

    Example

    Assuming 60% of power consumed does actual work, 80 Watts represents the 40% of the power that becomes waste heat.
     
  3. Pressure macrumors 68040

    Pressure

    Joined:
    May 30, 2006
    Location:
    Denmark
    #3
    Indeed, Thermal Design Power indicates the amount of heat a certain cooling solution is required to dissipate.
     
  4. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #4

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