Hi all!

Today I measured various levels of power consumption of my Early 2009 iMac
24" 2.93 GHz (Intel Core 2 Duo processor).
In case someone may be interested, I thought about sharing them here :-)

My iMac has 6 GB Ram, and an ATI Radeon HD 4850 graphic card with 512 MB.
I set the screen brightness to minimum (System Prefs / Monitor).
I tested it with OSX 10.6.8 and Windows 7 (via Bootcamp).
A different hardware configuration and/or OS version might produce somehow
different values.

Values are in Watts, with a 220V voltage (I live in Italy).
(I am unsure whether using a different voltage means different Watt numbers)
I used a meter called SavePower PM-6300, similar to the Kill-A-Watt common
in the USA. Not very accurate, but good enough for this purpose.

*** Mac OSX 10.6.8
- Off = 2
- Stop (sleep) = 2-3
- Idle at desktop (no open apps) = 88-90
- Idle with screen off = 44-46
- Idle loaded (3 GB Ram occupied) = 90-92 (+2)
- Call of Duty 2 playing = 145-155

*** Windows 7 (Bootcamp)
- Idle at desktop (no open apps) = 102-112
(102 after boot - 112 after some use)
- Idle with screen off = 68-70
- Firefox open = 113
- Sniper Elite III playing (+ Steam on) = 162

Notice the higher power efficiency of OSX over Windows: just being idle at
desktop (basic consumption), Windows draws around 20W more than OSX.
With screen off (not dimmed, completely off), there's even an higher
difference: Windows draws 24W more.
And that happens even having more background processes open in OSX than in
Windows (I use Windows just for gaming).

For a comparison with the old PPC times, my PowerMac G5 2.7 GHz DP with
Radeon 9600 XT drew between 160W at idle and 310W playing Call of Duty 2!
And this was just the CPU, without the monitor.


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