Testing Cooler Master Power Supplies
Now that we have tested two cheap PSU units it is time to see what you get if you decide to pay a bit more. Cooler Master provided us with three different units to be put through their paces.
We put got some help of Cooler Master employees turning the 1001 knobs on the load testing gear, here you can see Ron the local tech guru doing his thing:
The first of the Cooler Master PSU we tested was the 620W Real Power M, we hooked it up to the test station and were ready to go with 50% load:
Stable volt lines, high power factor, efficiency at 85%. Impressive numbers.
Efficiency takes a small hit at 75% load, but remains above 80+. Volt lines are again very stable. On to 100% load:
To be able to get 80Plus certified you need to have 80% efficiency at 20/50/100% load, the Real Power M 620W passes that test.
Next we wanted to see what it takes for this PSU to automatically shut down, we started the overload test, when the PSU failed we reset the system and measured the values at the edge of stability… here are the results:
This 620W unit was able to deliver 856W of power, and although efficiency was no longer above 80% you have to take into the account the fact that this unit running 38% above the rated wattage, which is nothing less than stellar!