Re: iMac 24" Early 2009 - Power consumption info

[GMail Valter Psicof]

Il giorno 17/10/16 06.38, "Bruce  Johnson" ha scritto:

> BootCamp is not emulated: it¹s running windows natively on the Mac hardware;
> however the drivers for the Mac may well not be optimized for power
> consumption.

That might be it, but I think it's mostly Windows that's more "loaded" with
myriad software "pieces" (sucking CPU cycles and hence power).
One hint it's when you boot the two OSes: on my iMac OSX 10.6 it's operative
in less than one minute (55"); OTOH, Windows 7 on the same iMac takes at
least 2-3 minutes to be responsive.
And it's not because of my hardware; on my girlfriend's relatively recent
Core i7 laptop, Windows takes around the same time (2-3') to be responsive
after boot.

What I take from these observations, it's that Windows is - like most
Microsoft software - quite bloated :-)


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Re: iMac 24" Early 2009 - Power consumption info

[Bruce Johnson]

> On Oct 15, 2016, at 5:28 PM, N. Shani  wrote:
> 
> One explanation as to why Windows will show a much higher power consumption 
> may be related to the fact that it is emulated?

BootCamp is not emulated: it’s running windows natively on the Mac hardware; 
however the drivers for the Mac may well not be optimized for power consumption.


-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs

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Re: iMac 24" Early 2009 - Power consumption info

[N. Shani]

G5 was called one time by Bruce a space heater. I can attest that when my old 
G5 was stressed, the fans sounded like a Jumbo taking off.
By comparison, Intel CPUs are way better with their power.

One explanation as to why Windows will show a much higher power consumption may 
be related to the fact that it is emulated?

As for the power consumption vs. voltage, a higher supply voltage is a bit 
better than lower one: less loss due to lower current, but the values are not 
significant.

Thanks for sharing. Cheers, Naftali

> On Oct 15, 2016, at 7:24 PM, GMail Valter Psicof  
> wrote:
> 
> 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.
> 
> HTH,
> Valter
> 
> 
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iMac 24" Early 2009 - Power consumption info

[GMail Valter Psicof]

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.

HTH,
Valter


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