How to know power consumtion of a server (or PC)

In catalog of server/pc, we only see the Max of the Power suply (for example: the power of case can supply max 500W)

But how to know the real power consumtion of the case?

Thank you!
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bxglxbxglx2000Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
That depends entirely on your usage and the configuration of the server.  You can get real-time information using a device like a kill-a-watt meter.
http://www.p3international.com/products/special/P4400/P4400-CE.html
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arichakraCommented:
A server normally use around 70% of rated power at top load. Power consumption  is much less while the server is sleeping!!

http://h18004.www1.hp.com/products/blades/thermal-logic/index.html?jumpid=ex_r163_in/en/esn/eb/isb_dynpwrcpp_googlesemaw/&s_kwcid=TC|14808|server%20power%20consumption||S|p|5163622711

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Lee W, MVPTechnology and Business Process AdvisorCommented:
arichakra - Why would you EVER let a server sleep?  Power consumption depends on use and utilization.  A CPU under full load uses a lot more electricity than a CPU under light load.  

Can you explain what your link means and relates to?
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nobusCommented:
you can use the online power calculators to have an ide, but the kill-a-watt is more accurate :
http://www.extreme.outervision.com/psucalculatorlite.jsp
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Dr. KlahnPrincipal Software EngineerCommented:
Agree with leew and nobus.  The kill-a-watt is not only accurate, it's cheap -- you can buy one for about $18.
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pnautaCommented:
You could, if the server is a Dell, read it from the machine itself, using Dell Openmanage software.  HP and other A brands will have a similar function.
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bxglxbxglx2000Author Commented:
Thank you all !
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