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Recently I re-discovered the powercfg.exe command line tool that's built into Windows. Haswell is amazing, to be clear, but it's all the components working together - chipset, wifi adapter, processor - that make for a truly compelling machine. Whatever machine I get next to replace the X1 Carbon Touch (likely a Yoga 2 Pro) will be a Haswell, and ideally it will support "Connected Standby." Connected Standby is a low-power state that lasts for tens (or hundreds) of hours, but allows the PC to play music, refresh email, and receive VOIP calls.
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I use an irresponsibly power hungry desktop at home, an Ivy Bridge Intel Lenovo X1 Carbon Touch for work, a Surface 2 (for email, remote desktop (RDP), videos, games and airplane stuff since I don't sweat its batter) and I'm also testing this prototype Haswell that Intel sent me.
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There's been a lot of talk about power and energy usage by PCs lately, especially ones on battery.
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