iMac Power Consumption

Discussion in 'iMac' started by webcakes, Nov 19, 2009.

  1. webcakes macrumors newbie

    Jul 5, 2009

    I'm considering to buy a new iMac (21,5"/nvidia or ati) and I'm wondering if someone has already measured the actual power consumption. In it's environmental paper, Apple documents that it uses less than 2W in sleep mode and 37,5 W with the display off. Did anyone try if this is also measured in real life?

    I may sound a bit paranoid, but half a year ago I bought a mac mini 2007 at a stock clearance, and I was shocked to find out that just the powerblock plugged in already consumes 8W, the mini itself in standby consumes 11W. Add to that a screen, external speakers and an external disk and the total standby power consumption of the lot is 25W. Terrible.

    Besides the energy consumption, I'm also a bit disappointed with the speed of the mini, but that's probably largely due to the low RAM (1GB). So rather than going for the latest mini model, I'd like to go for the power of an iMac. But I would be really happy if someone could confirm the power consumption. Specifically I'm looking for power consumption
    - in sleep mode
    - while streaming itunes to an airport express, with the display off
    ( I assume the display goes to sleep automatically when streaming. Right?)
    - while in normal, not too heavy operation (eg surfing, mailing & itunes)

    Thanks for measuring !

  2. Dylotic macrumors newbie

    Oct 30, 2009
    Ok i measured mine.

    IMac 21.5 CD3.33Ghz ATI4670

    Sleep 2-3 Watts
    Surfing web 90-93 Watts

    Didn't measure screen off and totally powered down.
  3. webcakes thread starter macrumors newbie

    Jul 5, 2009
    Thanks ! This is reassuring. Now I'm still wondering about the behavior when streaming. I use the Remote app on my iPod touch for this. I assume the screen will light up when you wake the iMac from sleep with Remote, but then switch off after a while (according to energy saver settings).

    Could anyone confirm this? Also a power measurement of this 'streaming-with-display-off' state would be nice.

    Thanks !

  4. miniroll32 macrumors 65816


    Mar 28, 2010
    This is a really dumb question, but in the household, what is the equivalent of this 2/3 watts while the iMac sleeps? :)
  5. fhall1 macrumors 68040


    Dec 18, 2007
    (Central) NY State of mind
    Less than a nightlight bulb (usually 7 watts - but I think there are some 3 watt bulbs too)
  6. Stealthipad macrumors 68040


    Apr 30, 2010
    It is so little it is not even worth the worry. Our government has so many worried while Al Gore jets around is a plane that uses more fuel in a few minutes than a car would use in a WHOLE YEAR!:eek:
  7. webcakes thread starter macrumors newbie

    Jul 5, 2009
    2-3 Watt may not seem a lot. But it is if this is running all year round. Here in Belgium, 1W Standby will cost 2 Euro per year. If you add this up for all the electronic devices in a household, you easily have 100 or 200W or even more standby power. That's 400Euro ! Would buy me some nice Mac goodies.... In a normal household easily 20% of electricity consumption is from standby power. I think this is really disgusting.Producers of electronic consumer goods are doing too little to limit this standby power consumption. And governments are not making the correct legislation to enforce this.

    So when I buy a device, I really try to find out about standby consumption. Hell, it should be on the box, in large letters ! So compared to the 15-20W that a Router or a set-top box consumes, the 2-3 Watt for an iMac seems acceptable. (I did by an iMac, fantastic machine !). But I was disappointed to find out that my iMac is using 8 Watt in standby.
  8. mrsir2009 macrumors 604


    Sep 17, 2009
    Melbourne, Australia
    Does anyone know the power consumption of a 13" MacBook Pro in sleep mode?

  9. Stealthipad macrumors 68040


    Apr 30, 2010
    At prices they charge where you live, what kind of "Mac Goddies" can you buy for that savings!?
  10. madwolf macrumors member

    Oct 11, 2009
    400euro? nearly an iPad
  11. dolphin842 macrumors 65816

    Jul 14, 2004
    Do you need to wake up your computer from sleep remotely? If not, make sure wake-on-lan is disabled (System Preferences-->Energy Saver-->uncheck "Wake for Ethernet Access"). That should save a few watts when sleeping.
  12. jmerrett macrumors newbie

    Jul 22, 2010
    Power Saving

    Other areas that can be shut off if not being used that will help reduce power consumption are Blue Tooth and Airport. I also see a measurable temperature difference in my MacBook when I turn these off, especially Airport.


    iMac 21", (2) MacBook 13", (2) G4, (3) iPhone

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