I researched the 410c schematic as suggested by tbr. I can measure the input voltage at J1 and measure the input current as a voltage across the .1Ohm resistor

I researched the 410c schematic as suggested by tbr. I can measure the input voltage at J1 and measure the input current as a voltage across the .1Ohm resistor r77 or pads 1 and 2 of j10 (both on the bottom side of the board). Idle, text 15.2v 115mA 1.75W Idle, X 15.2v 124mA 1.89W 1CPU, X 15.2v ~180mA 2.74W 2CPU, X 15.2v ~240mA 3.65W 4CPU, X 15.2v ~260mA 3.95W All of my CPU loading scenarios had much more variable current readings, I tried to record the highest value I saw on a multimeter with a ~.5s update time over 10+ seconds.