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How much power is used when in StandBy mode

Posted on 2004-08-11
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Last Modified: 2012-05-05
I'm just curious of approximatly how much power is used when my computer is in standby mode?

amd 2500 +
2 7200 rpm hard drives..
CPu fan, case fan, chipset fan,
360 watt power supply..
thanks

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Question by:Arron_S
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by:Callandor
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That would really depend on what your ACPI power settings were.  Here's an article on hard disk power savings: http://www.princeton.edu/~lzhong/publications/dard/node6.html
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Blue_Rishi earned 125 total points
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Callandor is right. However, let me give some more detail...There are 5 ACPI states (S0 - S5), in S0 the computer is working and S5 means the computer is off (still consuming some power on ATX as the mainboard still receives power). S1 through S4 are so-called sleep states, in S1 and S2 the CPU is stopped and the mobo is slowed down; the monitor and hdd might be turned off too (if set to do so). S3 is reffered to as suspend to ram (mostly known from laptops) here the whole system is shutdown except for memory and wake-up signals. The memory enters a slow refresh state, thereby consuming less power too. S4 is reffered to as suspend to disk, known from the windows hibernate function; memory contents are stored on disk and the system is powered off. CRT monitors use anything between 1-15 watt when in standby/sleep/off mode (screen blank is not for powersaving but to prevent burn-ins, much like a screensaver). S3 should be consuming less then 30 Watt, while S4 should consume less then 5 (as will S5). Other states S0-S2 will depend on your system and configuration. Some manuals (monitors, mobo's, etc.) will acually state the power consumption when operating and when sleeping. If you can get all the numbers, you can do the math.  

Hope this anwers your question,

Blue Rishi

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by:Arron_S
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Hey thanks Blue Rishi
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