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About the Author
Dennis Forbes Dennis Forbes is a Toronto-based software architect. While focused primarily on the .NET and SQL Server worlds, Dennis frequently ventures outside of this comfort zone into game development and image processing. He has been published in several industry magazines, has been quoted in the Wall Street Journal and has been interviewed by NPR.

He is a vice president and lead software architect at an innovative New York City hedge fund back-office services firm.

Dennis has been working on solutions for the financial, telecommunications, and power generation markets for over 15 years.




The Feed Bag

 
Thursday, June 17 2010

The latest Mac Mini is a slick little device. What really makes it stand apart – in the world of PCs, where it’s a very competent entrant – is the shocking power efficiency of the device.

Viewing a static web page, one reviewer found the device used a miniscule 6W of power.

The PC that I’m typing this entry on – a very typical example of ordinary PCs – is wasting some 40W of power in power supply inefficiency alone at idle. Yet the Mac Mini is managing to provide a good computing experience with 1/6th that, under a load using 1/6th the power a typical PC consumes under a load.

Amazing.

The Mac Mini isn’t the first to move us in the right environmental direction, after years of escalating power demands (just look at the power consumption of current generation consoles to see how gluttonous devices have become. Watching a movie on an Xbox 360 could literally cost you $0.20 in electricity alone, not to mention the environmental impact).

The more powerful my smartphones have become, for instance, the more often my PCs are frozen in S3 Sleep. The effect is amplified as people move to very low power devices like the iPad, doing many of the tasks that they would have powered up the home PC for (or worse, kept it running around the clock to have it available) instead on that ultra-low power device.

The impact is measurable. The financial impact is significant (leaving a PC on around the clock costs some $20 a month). The environmental impact – or reduced impact – is invaluable.

Reader Comments

Wow I had no idea the Wii used so much less power. Good to know. I'm hoping that some of the technology that manages to power webphones with 1Wh batteries can make its way over to desktops.
Gerald @ 6/17/2010 6:01:46 PM
Add some charts or something of the various players. It would make the information clearer.
Thomas S @ 6/17/2010 6:36:40 PM
$20/m to run a PC continuously?! What unearthly $/kwhr does your utility charge?!
Noah Yetter @ 6/17/2010 8:01:40 PM
Hey there Noah.

The local power is, fully-costed in (adding the various delivery and other charges), $0.16/kWh. A PC on around the clock for a month will clock in at around 122 kWh, or about $19.58 a month.

And of course now we're moving to time-of-day premiums so the average per hour is only going up.
Dennis Forbes @ 6/17/2010 8:14:17 PM
That's pretty hefty. In Colorado we pay $0.046/kWh up to 500 then $0.09/kWh after that.
Noah Yetter @ 6/18/2010 8:23:55 AM
We have some posted rates that are lower -- it is like 6c and 9c tiered, but then they layer on debt reduction charges, transmission charges, line-loss factor charges, and so on, giving the eventual 16c, and only heading up.

http://www.eia.doe.gov/electricity/epm/table5_6_b.html

It looks like most US states are in the same ballpark, with Connecticut coming it at an impressive $0.19/kWh. I assume that the various customer charges are in addition to that.
Dennis Forbes @ 6/18/2010 11:43:36 AM

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