Articles: Cases/PSU
 

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UPS Compatibility

Working together with our APC SmartUPS SC 620, the PSU was stable at loads up to 372 watts when powered by the mains but couldn’t switch to the UPS’s batteries even at 280 watts.

Cross-Load Voltage Stability

The HP-D5201AW is rather poor in this test even for its class:

The +12V diagram is typical of PSUs without dedicated voltage regulation. However, there is an additional problem here: the +12V voltage sags too much when there’s a high load on the +12V and a low load (less than 10 watts) on the other rails.

The +5V voltage is more than 5% off the required level at loads above 100 watts, so it doesn’t meet the PSU specs. On the other hand, this voltage is going to be within 3% in the typical load range.

The +3.3V rail is the most stable one. Its voltage is always within 3% of the required level and even within 2% in the typical load range.

Output Voltage Ripple

The high-frequency voltage ripple would be normal if it were not for the huge spikes that coincide with the transistors’ switching.

The same goes for the low-frequency ripple.

We don’t think this is going to affect the functioning of the PSU, yet we wouldn’t recommend it to audiophiles.

Temperature and Noise

The PSU is cooled by a 7-blade 120mm Superred CHB12012DS fan manufactured by the Taiwanese firm Cheng Home Electronic.

Alas, the HP-D5201AW is far from quiet. The initial speed of its fan is as high as 1200 RPM, which is quite audible already. The fan begins to smoothly accelerate at loads of 200 watts and higher, reaching 2500 RPM at full load. And that’s not just loud, but very loud. For all this noise, we can’t say the PSU is cooled well. The difference between the incoming and outgoing air is up to 11°C, which isn’t small.

Thus, this PSU can’t be recommended to anyone who cares about noise.

Efficiency and Power Factor

The HP-D5201AW is 85.5%, 86.6% and 82.7% efficient at 20%, 50% and 100% load, respectively. Its peak efficiency of 86.8% was observed at a load of 265 watts.

The efficiency meets the 80 PLUS Bronze requirements although this PSU series lacks even basic 80 PLUS certification.

The power factor is rather low for a PSU with active power factor correction. It’s not higher than 96.2% although active PFC is expected make it as high as 98-99%.

Standby Source

The standby voltage doesn’t sag at high loads.

Summary

The HIPRO HP-D5201AW features unexpectedly high efficiency and good exterior design (high-quality metal, sleeved cables) but it is very noisy and doesn’t deliver stable voltages.

 
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