Temperature and Noise
This PSU is cooled by a fan from the Chinese maker Fujian. Although the brand is rather obscure, the 135mm fan is high quality. It doesn't produce unwanted sounds and has bright highlighting. Of course, it may prove to have a shorter service life than its more renowned counterparts, but again, the Fujian FJ1352512SH fan is blameless when new.
The fan starts out at a speed of about 860 RPM and keeps it until a load of 170 watts. Then it begins to accelerate smoothly. The fan doesn't reach its maximum possible speed, though. When the PSU is under maximum load, the fan rotates at 1700 RPM (the same fan would reach over 1800 RPM in the Hiper K800 PSU).
Although the fan isn’t slow at medium and high PSU loads, its noise remains within comfortable limits until a speed of 1300-1400 RPM (at a load of about 400 watts).
The cooling is quite efficient. The difference in temperature between the incoming and outgoing air increases at higher loads but is never larger than 10°C.
So, the Hiper M600 can hardly satisfy you if you need a perfectly silent computer, but most users are going to feel comfortable with it.
Notwithstanding its active PFC, the M600 showed good compatibility with my APC SmartUPS SC 620. The pair was stable at loads up to 315 watts when powered by the mains and switched to the UPS batteries normally at the same load.
Output Voltage Stability
The PSU didn’t quite make it to its specifications. It wasn't stable when the combined load on the +5 and +3.3V rails was over 140 watts. When the load reached the specified maximum of 150 watts, the Power Ok signal would vanish, causing the PSU to shut down. This is not a serious downside, though. A modern computer can hardly want more than half that power across those two rails.
The +12V voltage deflects more than 3% from its nominal value at high loads on the +3.3V and +5V rails combined or when the load on the +12V rail is less than 25 watts, both being unlikely situations. By the way, the PSU would start up normally at zero load.
The +5V voltage goes out of the 3% limits when the load on the +5V rail is either too low (below 15 watts) or too high (over 80 watts). Neither case is typical of modern PCs.
The +3.3V voltage is blameless. It only deviates by 3% when all of the power rails are loaded to their maximums.
Output Voltage Ripple
The high-frequency voltage ripple is strong on each line, with occasional spikes shooting beyond the permissible maximums. Still, I’d say that the PSU complies with the industry standard in this parameter.
The same goes for the voltage ripple at the double frequency of the power mains.
Efficiency and Power Factor
The Hiper M600 delivered rather ambiguous results in this test.
Its active PFC is far from efficient as the power factor hits 0.9 at a load of 422 watts only and reaches 91.3% at full load. This is better than any passive PFC, though. Besides, this parameter is not important for home users.
Contrary to the power factor, the efficiency factor of this PSU is quite high. Despite the lack of any 80+ certification, the Hiper M600 meets the 80+Bronze requirements, being 85% efficient through the larger part of its load range. Well, Andyson’s native PSUs based on this platform are 80+Bronze certified, actually.
+5V Standby Source
The standby source copes with its job without any problems.
The Hiper M600 is quiet at low and medium loads, efficient (despite the lack of official certification, it meets the 80+Bronze requirements), compatible with UPSes, and offers a good selection of connectors for a PSU of its class.
On the downside are the rather low load capacity of the +12V rail, low-efficiency active PFC, and short cables (especially for system cases with a bottom PSU bay).
Thus, this model can be recommended for not-very-advanced configurations assembled in not-very-large system cases, especially as Hiper puts an attractive price tag on it. But you'll want something better for a serious gaming station, of course.