**Efficiency, PFC and Voltage Regulation**

**Voltage Regulation**

*To test voltage regulation we load the power supply to five different load scenarios that give an equal spread of load across every single rail. So that means 20% on all rails, 40% on all rails and so on. We then calculate the average deviance of each rail from its expected voltage.*

Voltage regulation is pretty good overall, but there’s noticeably a slight drop at 100% load. I don’t expect this to be of any concern, but it couldn’t hurt for CM to improve on it in future models. On average there is only a very small deviance and that’s certainly a good thing.

**Power Efficiency**

*Power efficiency is measured by calculating actual supplied wattage divided by the wattage drawn at the wall/plug, multiplied by 100 to give a percentage. We then compare that to the particular 80 Plus certification the company claims to see if it meets that. You can see the 80 Plus certifications below, we always test 230v power supplies.*

This may be an 80 Plus Gold rated unit, but it’s scored more into the Platinum rating that I would have expected. This is a great as the unit is going to be more energy-efficient and will save you some extra money on your electricity bill over time.

**Power Factor Correction**

*Power Factor Correction is the ratio of the real power flowing to the load, to the apparent power in the circuit. The aim of PFC is to make the load circuitry that is power factor corrected appear purely resistive (apparent power equal to real power). In this case, the voltage and current are in phase and the reactive power consumption is zero. The closer the number to one the better as this allows the most efficient delivery of electrical power (Source – Wikipedia).*

The PFC is about where I expected it to be and scores best from 40% load and above, which is most likely where your PSU will be getting the most use, so that’s another positive factor for this unit.