Cooler Master G750M Semi-Modular 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.

While I do think quite highly of Cooler Master products in general, I must admit I was expecting this to be a bit rubbish when it came to voltage regulator, but it was actually very consistent. The -12V looks a little low, but shouldn’t be any cause for concern.

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.

Efficiency on this unit was pretty remarkable, I know it’s branded an 80 Plus Bronze unit, but it’s withing shouting distance of being at 80 Plus Silver unit and that’s no bad thing, as it’ll help save you more on your electricity bill in the long run.

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).

PFC was pretty average, although that’s not really a bad thing, as the results here are perfectly OK; could be better, could be worse.