be quiet! Dark Power Pro 11 1200W Power Supply Review

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.

The voltage regulation on the Dark Power Pro 11 is very impressive, with only the 3.3v creeping above 1%, although it’s still very much within acceptable parameters. Results are very consistent across the load range and it’s as good as you would expect from a premium grade PSU.

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.

The PSU conforms perfectly with the 80 Plus Platinum specification, certainly no complaints here.

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).

Very strong and consistent PFC performance, again, this is what we would expect to see from a high-end product such as this.