975XE stock power consumption figures (and efficiency of a vcore regulator)

[cirthix]

Here is a plot compiling 20M datapoints to show the actual current consumption (vcore=1.22v) of a stock 975xe under the full range of operating conditions. CPU load was done through intelburntool with 0 through 8 threads and data captured for 200 seconds with a scope. IMON was used for current monitoring and was calibrated within 1/2% of true output current prior to the test. CPU temperature was 60C under full load, measured with realtemp 3.0.

The blue line is a heavily filtered plot of efficiency, the yellow data is lightly filtered efficiency data, but you can use it to gauge the range of the cpu current (horizontal extent of the yellow plot). It's interesting to see that cpu current ranges between 14 and 93A, a good bit lower than generally thought.

I can't say what motherboard was being used, but it was a rather nice x58 board. Consider it typical for a vcore regulator.