Does offlining a CPU save power?

For example, if I do something like this on a Core i7 CPU - will it save 
any power?

echo 0 > /sys/devices/system/cpu/cpu2/online
echo 0 > /sys/devices/system/cpu/cpu3/online
echo 0 > /sys/devices/system/cpu/cpu4/online
echo 0 > /sys/devices/system/cpu/cpu5/online
echo 0 > /sys/devices/system/cpu/cpu6/online
echo 0 > /sys/devices/system/cpu/cpu7/online


Say, I have a PC which needs to be turned on all the time, but is mostly 
idle at night.


-- 
Tomasz Chmielewski
http://wpkg.org

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