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 Post subject: Sleep Mode Power Consumption?
PostPosted: Fri May 09, 2008 3:33 pm 
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Joined: Sat Aug 06, 2005 7:41 am
Posts: 116
Location: RSA
Hi all,

I've recently upgraded to Vista and have started using it's sleep mode instead of switching my pc off at night. It starts up much quicker this way.

How does the power consumption differ? By switching off my pc i mean it's off, but still plugged in and switched on at the wall socket - so that the lights on the mobo stay on.

Specs:

Abit IP35 mobo
E6750
320GB HDD
2gigs ram
ATI X1950GT


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 Post subject:
PostPosted: Fri May 09, 2008 3:41 pm 
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SPCR Reviewer

Joined: Fri Mar 04, 2005 9:07 pm
Posts: 1023
Location: Vancouver
If it suspends to RAM it should use about 1-2W more than when it's just turned off.


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 Post subject:
PostPosted: Sat May 10, 2008 3:44 am 
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Joined: Wed Apr 05, 2006 4:10 am
Posts: 132
Location: Colchester (nuked in 1984)
My PVR machine, a ibase itx mobo with a p4 mobile cpu, draws almost as much power in sleep as idle! (since sleep keeps most of the motherboard running). I now use Hibernate, which effectively uses the same power as 'off'.

It might be a good idea to borrow a power meter or current meter to measure the pc's actual useage.

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 Post subject:
PostPosted: Sun May 11, 2008 1:38 am 
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Joined: Sat Aug 06, 2005 7:41 am
Posts: 116
Location: RSA
Well the northbridge heatsink is cool to the touch, and all the fans switch off, so it can't be drawing as much power as it does in idle.

A power meter would be a good idea, but that would involve money and/or effort. I was hoping someone here had already done some testing :D


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 Post subject:
PostPosted: Sun May 11, 2008 7:19 am 
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Joined: Fri Mar 04, 2005 9:07 pm
Posts: 1023
Location: Vancouver
Bobendren wrote:
A power meter would be a good idea, but that would involve money and/or
effort. I was hoping someone here had already done some testing :D


Most of our motherboard reviews measure power consumption under Vista with the system off and idle - the difference is always 1W. All the systems I've tested at home are about the same, including mine which has an overclocked E8400, 4GB of RAM, and 8800GT.


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 Post subject:
PostPosted: Sun May 11, 2008 10:23 am 
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Joined: Mon Nov 27, 2006 6:51 am
Posts: 393
Location: The Netherlands (NL)
What I can remember when I tested my system:

powercord unplugged 0 watts
powercord plugged, pc off 10 watts (yes frustrating)
powercord plugged, pc sleep (suspend to ram) 10 watts
idle -> a lot more (150 or so)

Core 2 Duo, asus p5w dh deluxe, 4gb ram.


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 Post subject:
PostPosted: Sun May 11, 2008 2:21 pm 
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Joined: Sat Aug 06, 2005 7:41 am
Posts: 116
Location: RSA
Awesome, thanks for the replies guys! I'll stick with sleep mode then. :)


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 Post subject:
PostPosted: Wed May 14, 2008 11:58 am 
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Joined: Sun Sep 28, 2003 10:28 am
Posts: 71
for those who don't measure a difference between idle and sleep, the computer most likely is entering S1 standby instead of S3 standby, the latter of which switches off nearly all components but RAM and some other stuff needed for wake-up from S3. S1 is quite useless from the power consumption reduction perspective (in fact, I have still to figure out from which perspective it isn't useless).

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