We measured the power consumption of our entire test system at the wall while loading the CPU using Prime95 and GPU using FurMark. We also measured the power consumption with the system resting at the Windows 7 desktop.
The Alpha Pulse needs as much power as we would expect from an overclocked Ivy Bridge system. At full load the system consumes around 50% of the available 850W from the XFX power supply, which would deliver the highest overall efficiency rating.