The output voltages are almost ideally stable. The +12V voltage never deflects by more than 1%! The +5V and +3.3V voltages are somewhat worse, but never exceed the allowable deflection of 5% in any point of the diagram even at greatly misbalanced loads.
The senior model is as good. Its area of allowable loads has stretched out along the X-axis and transformed from a rectangle into a trapezium – this is due to the above-mentioned 200W addition to the load capacity of the +12V rail.
The output voltage ripple is low even at full load, never approaching the limits.
Each of the PSUs is cooled with an 80x80x25mm fan (Adda AD0812HB-A76GL).
In the junior model the fan starts out at a speed of below 2200rpm and keeps it until a load of 300W. I won’t call this PSU noiseless, yet it only becomes really loud at a near-maximum load when the fan speed is approaching 3000rpm.
The senior model is somewhat noisier, probably due to the deviations in the component ratings. The difference in the fan speeds is only about 100rpm. This fan accelerates later, at a load of over 400W.
The senior model is over 80% efficient throughout most of the load range, reaching 83% at the maximum. That’s a good result for today. The junior model is about 1% less efficient. The power factor is easily above 0.95 thanks to active PFC.
So, the Hiper Type M power supplies left an ambiguous impression on me. They boast good parameters, superb stability of the voltages, quiet operation but all of this seems to be negated by the soldering defects I found in them. Moreover, the Type M models have problems with UPSes and lack more SATA plugs among the native connectors. It’s rather odd to see a high-wattage and expensive PSU that makes the owner of a simple modern system (with one HDD and one optical drive) use two adapters.