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The Macbook Pro Model MC374, MC375 from 2010 consumes only 6.6W when idle (without display) when powered with 100V to the power supply.

How can I build a modular, high-spec computer which will have similar power consumption when idle - i.e. when the system is normally running, but the user (nor any daemon on the system itself) is doing anything, just waiting for user input?

I do not care very much about the power consumption when the system is used, but I want the power consumption when CPU utilization is below 1% to be as low as possible.

I don't want the Mac, because I want the machine to be as modular as possible, preferably not a laptop, which are never too modular, but maybe some mini-ITX or even full size ATX board.

I would like to be able to have at least 4 GB RAM in the machine, preferably 8 GB or more, and for it to be a powerful computer when used, comparable in processing power to a AMD Athlon64 4000+.

Do component (motherboards, CPU, memory), from which I can build such a machine exist?

Are there any tricks like undervolting, underclocking that I can use to reduce the power consumption when idle without losing too much processing power when non-idle (losing 50% is OK)?

ria
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3 Answers3

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Since you mentioned a MacBook Pro, have you considered Apple products? Apple advertises the current Mac Mini as "the world's most energy-efficient desktop computer." See: http://www.apple.com/macmini/environment.html

Seems like it gets pretty close to what you're looking for. Idle power consumption is advertised at 9 watts.

Perhaps this won't quite work for you since you want it to be modular, but looking at the components they use for it is a good start.

entropo
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Another strategy is to start with a processor. The fastest low-voltage processor (17W TDP) available today is Intel's i7-2657M. Going up to 25W TDP, there is the i7-2649M. All modern processors will clock-down when idle, but when you get processors that are optimized for lower TDP's, they're usually using low leakage-current transistors and will thus use less power at the same clock rate as other processors (at the expense of not being able to clock as high).

entropo
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Wow, 6.6W is pretty low even for a notebook these days.. How did you geht this number? Simple power meters may have errors in the same order of magnitude, because a switched power supply is not really a simple resistor whe you look at AC voltage and current.

Its hard to go < 30 Watts with COTS PC parts. Example: A simple 3,5" 7200RPM Hard disk drive will draw about 7 W alone, just when its platters are spinning.

That said, there are "PC" componets available that have the power-saving note- and netbook chipsets and CPUs onboard. But they are expensive and harder to get. A complete notebook may be cheaper.

The german magazine c't had an overview of current desktop CPUs, including (primary=AC) power consumtion. The lowest were the new Sandy-Bridge Intel CPUs with about 23 W idle.

Turbo J
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