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Home Server Power Consumption Reduction

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http://askubuntu.com – I am running Ubuntu Server 12.04 on an HP Mini 311. It has an Atom 270, 3GB ram, NVIDIA ION graphics. When running windows 7 with the screen off and no programs running the power consumtion from the wall was measured as 7-9W. With Ubuntu server running, with ACPI, powertop options good. the power consumption is 17-20W. powertop reports that speedstep is clocking the CPU at 800MHz instead of the max 1600MHz and that the CPU is idling at least 95%. What other optimizations does Windows do that I can also customize to bring the power consumption down to a minimum? Some other Details: Power cons (HowTos)