Running Windows 8.1 enterprise, with 4x16GB DIMMS, a 2.5" 120GB Micron M500 and a M.2 32GB Sandisk SSD. Ethernet cable plugged in to 1GB port, not exercising the port.
I utilized the 4pin header (not an ATX supply)...the system would not boot on anything below 15VDC (literature states 12VDC power option)...hmmm, boo).
So, at the desktop, no applications running:
15.08V @ 1.63A = 24.58W
Running Prime95 on all 16 threads:
14.77V @ 5.05A = 74.59W
Keep in mind, this is the power consumption of everything...mainboard, memory, SSDs, fans. Not too shabby for the kind of performance this system has.
I'll scale back the memory a bit, and see how much the power consumption changes.