princebr1
Level 1 (4 points)
Desktops

Q: max wattage

hi there,

 

does anyone know what is the max wattage used by:

 

1. a mac pro 8 core (early 2008) when working at its full capacity? that is to say all the 4 disks + gf 8000 gt graphic card

 

2. same for iMac 21.5inch 1.6Ghz dual core i5, intel hd graphics 6000

 

3. and 2.8Ghz quad core intel i5, intel iris pro graphics 6200

 

i need to buy a ups and need to have this info. astonishingly enough tech support did not have this info.

 

Thanks

Posted on Sep 7, 2016 12:11 PM

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princebr1

Q: max wattage

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  • Helpful answers

  • by John Lockwood,

    John Lockwood John Lockwood Sep 8, 2016 3:13 AM in response to princebr1
    Level 6 (9,200 points)
    Servers Enterprise
    Sep 8, 2016 3:13 AM in response to princebr1

    A standard from the factory Mac Pro (or other model) would have a max wattage use figure that could be given but as soon as the user make a change by e.g. adding an additional or bigger hard disk, this figure will change.

     

    It does not help much but here is the official specs for your Mac Pro model

     

    Electrical and environmental requirements

    • ENERGY STAR configurations available6
    • Line voltage: 100-120V AC or 200-240V AC (wide-range power supply input voltage)
    • Frequency: 50Hz to 60Hz single phase
    • Current: Maximum of 12A (low-voltage range) or 6A (high-voltage range)

     

    For what its worth the classic Mac Pro models have a 980watt power supply meaning that is the absolute maximum it can deliver if fully loaded.

     

    If you want accurate figures based on your configuration and usage then the best option is to get a power socket which can measure the actual use. Here are a couple of examples of such devices.

     

    https://www.amazon.com/P3-International-P4460-Electricity-Monitor/dp/B000RGF29Q/

    http://www.belkin.com/us/F7C029-Belkin/p/P-F7C029/

  • by Grant Bennet-Alder,

    Grant Bennet-Alder Grant Bennet-Alder Sep 8, 2016 8:20 AM in response to John Lockwood
    Level 9 (60,617 points)
    Desktops
    Sep 8, 2016 8:20 AM in response to John Lockwood

    If the maximum current the Mac chassis can draw is "12A on low range (120Volts) or 6A on High range (240 Volts)" that can be converted, i.e., 120*12 Volt-Amps or 240*6 Volt-Amps, or about 1440 Volt-Amps. Then you must build in some headroom to keep it from shutting down prematurely when it gets close to those numbers. Volt-Amps are indistinguishable from Watts for this purpose (but not for every purpose).

     

    If you use the OUTPUT of the power supply as a guide, the numbers will be too low by the amount wasted as heat in conversion to DC power.