Alas, the output voltage ripple is not a strong point of this PSU. The oscillogram above was recorded with a time-base of 2ms/div at full load. You can see that the voltage ripple was as high as 150 millivolts on the +5V rail (the allowable maximum being 50 millivolts), over 350 millivolts on the +12V rail (the allowable maximum being 120 millivolts), and up to 100 millivolts on the +3.3V rail (the allowable maximum is 50 millivolts). That’s a catastrophic failure that actually means that the PSU cannot work at that load.
When the load is reduced to 520W, there are still voltage spikes in the diagram, but they are within the acceptable limits.
I also recorded an oscillogram with a time base of 10 microseconds/division under the same load of 520W at the moment of maximum pulsation: you can see it is within the allowable limits. But again, this result could only be achieved at a load which was over 200W lower than the maximum permissible load of the tested PSU.
There are problems with the cross-load characteristics, too. The +12V voltage is initially set at 12.5V and lowers to the required level only as the load grows on the corresponding power rail. It doesn’t violate the allowable limits, though, and it’s all right with the +5V and +3.3V voltages.
The PSU uses two fans made by Young Lin Tech: an 80x80x15mm DFB801512H and an 80x80x10mm DFC801012H. It’s not quite clear why the case is perforated with this type of cooling (one fan is sucking the air in and the other is exhausting it). I think it only worsens the cooling of the heatsinks since the air doesn’t flow along them but passes freely through the top panel.
The speeds of the fans are adjusted in sync and differ as much as the fan models differ between each other. Although the speeds are not high, the PSU doesn’t seem quiet with its two fans and a high aerodynamic resistance of the internal components that make the air flow audible. So, the PSU is just average in terms of noisiness.
The efficiency is good, being generally higher than 80%, but the power factor plummets to very low values at low loads despite the active PFC. The reason for that is the improper functioning of the active PFC device. It draws the current from the mains in nearly rectangular impulses, which is better than the short spikes of PFC-less PSUs but still far from a sinusoid.
Thus, the Hiper Type R HPU-4S730-MU V2 is a product from the “they tried their best but didn’t succeed” category. Its original, even unique, design proves very improper for a majority of system cases. The manufacturing quality provokes some criticism. And the main problem is that it cannot cope with a load over 520W, which is 210W below the specified maximum. If the load is higher than that, the output voltage ripple rises up to a catastrophic level, being two or three times as high as the allowable maximum.