Articles: Cases/PSU

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The cables of this PSU go out in one bunch:

  • Mainboard cable with a 24-pin connector (60cm)
  • CPU cable with an 8-pin connector (60cm)
  • CPU cable with a 4-pin connector (60cm)
  • Graphics card cable with two 6-pin connectors (45+4cm)
  • Graphics card cable with two 6-pin connectors (55+4cm)
  • Cable with one Molex connector (34cm)
  • Cable with one Molex connector (44cm)
  • Cable with one Molex connector (64cm)
  • Two cables with two SATA power connectors on each (49+15cm)

  • Cable with a USB connector (65cm). The connector is of the single variety due to the reduced number of the hub’s ports

As you can see, the 5M730 differs from the above-described PSUs in one thing only. It lacks “native” 8-pin connectors for graphics cards. Included with the PSU are Molex→2xMolex splitters and a couple of adapters for floppy drives.

Take note that the limit of current is set at 16A for every 12V line. So, although the PSU has two connectors on each graphics card cable, you should connect plugs from two different cables to your top-end graphics card to avoid stability issues.

The PSU worked normally at loads from 50 through 715W. Together with an APC SmartUPS SC 620 the power supply worked at loads up to 340W from both the mains and the batteries. The UPS switched to its batteries and back to the mains without problems.

The output voltage ripple is so low at full load that can be barely observed in the oscillogram.

The +12V voltage boasts perfect stability but the other two voltages are worse. The +3.3V voltage goes through the entire range from -5% to +5% while the +5V voltage sags suddenly at high load. As a result, the PSU cannot deliver the specified 170W across its +3.3V and +5V rails. However, the HPU-5M730-SE will have no problems powering a typical modern computer in which the +12V rail is the most important one.

The PSU is not very efficient by today’s standards. Its efficiency drops to 80% at full load and is not higher than 83% at the maximum. That’s just a normal result.

The fan is rotating at an acceptable 1800rpm until a load of 450W. Then it accelerates steadily to 2800rpm. Such speeds are not too high for an 80mm fan, so the 5M730-SE is a quiet, though not silent, power supply. The fan speed might be lower at minimum load.

On the whole, this model is definitely inferior to every other PSU covered by this review. The HPU-5M730-SE is not better than them in any of important parameters. It is not much inferior, though. The difference can hardly be felt in practice.

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