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power consumption after switching off monitor

ramya narayanan
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Joined: Oct 06, 2008
Posts: 338
Dear all,
What will be power consumption of a computer i.e. whether it will consume any power after we switch-off the monitor, eventhough the CPU is still on.
Regards.
Akhilesh Trivedi
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Joined: Jun 22, 2005
Posts: 1558
Something should have made google to come up with this :
http://www.blackle.com/about/


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David O'Meara
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Joined: Mar 06, 2001
Posts: 13459

I read something that disagreed with this, but I'm too lazy to look. If I remember correctly, black and white LCD pixels have the same or nearly the same power requirements, and the 'screen backing light' has a much greater effect.
Satish Chilukuri
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Joined: Jun 23, 2005
Posts: 266
Even if the monitor is switched off, your computer will consume power. The amount depends on what you've got inside - processor, graphics card, hard disk, cooling fans etc.. This can give a rough idea of how much power is consumed.
Jesper de Jong
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Joined: Aug 16, 2005
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  23

Originally posted by Akhilesh Trivedi:
Something should have made google to come up with this :
http://www.blackle.com/about/

"Blackle" doesn't really work with LCD monitors. Old CRT monitors do draw less power when they display a black instead of a white screen, but an LCD screen works totally differently and displaying a black instead of a white screen doesn't make any difference for the amount of power it draws.

If you really want to know how much power your computer draws, you could buy a power consumption monitor device to measure it.


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Ernest Friedman-Hill
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  34

Actually I'm not sure it's true that there's no difference; black pixels might actually use a bit more energy.


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sudipto shekhar
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Joined: Apr 02, 2008
Posts: 823

I think the power consumption of the monitor is greater when the whole computer is to be considered.... monitor+cpu :roll:


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Akhilesh Trivedi
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Joined: Jun 22, 2005
Posts: 1558
Originally posted by Jesper Young:

"Blackle" doesn't really work with LCD monitors. Old CRT monitors do draw less power when they display a black instead of a white screen, but an LCD screen works totally differently and displaying a black instead of a white screen doesn't make any difference for the amount of power it draws.

If you really want to know how much power your computer draws, you could buy a power consumption monitor device to measure it.


Hmm... and probably LCD screen draws MORE power to go black?
[ December 17, 2008: Message edited by: Akhilesh Trivedi ]
Bauke Scholtz
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Joined: Oct 08, 2006
Posts: 2458
If a LCD is switched off would it still display black against a backlight? Don't think so. It simply does nothing.
 
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