Articles: Cases/PSU

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The PSU is equipped with the following cables and connectors:

  • Mainboard cable with a 24-pin connector (55cm)
  • CPU cable with a 4+4-pin connector (55cm)
  • Graphics card cable with two 6-pin and two 6+2-pin connectors (50cm long; the individual cables with connectors are 20cm long)
  • One cable with three Molex connectors and one floppy-drive plug (45+10+10+10cm)
  • One cable with three Molex connectors (45+10+10cm)
  • Two cables with three SATA power connectors on each (45+10+10cm)
  • Cable of the fan’s tachometer (46cm)

As I wrote above, the power cables of peripherals are combined into a single braid that splits into individual cables only at the very end. The same is true for the graphics card cables:

The individual cables are long enough for you to connect two or even four graphics cards, but it would be handier if the cables were organized into two rather than one braid.

The electrical characteristics are identical to those of the MODU82+ 625W. The PSU has three “virtual” 12V lines with a max current of 25A on each and a combined current of 50A.

The PSU worked without problems at loads from 20W through 625W. Together with an APC SmartUPS SC 620 this power supply worked at loads up to 360W and 340W when powered by the mains and the batteries, respectively. The pair switched to the batteries normally, the UPS was stable.

The high-frequency output voltage ripple is far below the permissible maximum.

There is also low-frequency pulsation of a strange form but the PSU keeps within the required limits even if you count this pulsation in.

The output voltages boast superb stability. The +3.3V voltage is the only one to deflect by more than 3% from the nominal value, but this occurs at the maximum load. None of the voltages comes close to the maximum permissible deflection of 5% (this limitation is described in the industry standard) at any distribution of load among the power rails.

The PSU is 88% efficient at the peak and higher than 80% through the entire range of my measurements (from 50W to full load). An excellent result!

The fan speed graphs of the PRO82+ and MODU82+ nearly coincide: the fan starts at 500rpm and maintains a constant speed until a load of 200W. Then the speed grows linearly to 1700rpm. The subjective impression is the same: the PRO82+ is silent at low loads and very quiet at loads below 400W. At the higher loads you can hear the hiss of the airflow and the sound of the fan’s bearings, yet the noise remains within comfortable limits even at the maximum speed.

Thus, the only difference between the MODU82+ and PRO82+ series is that the latter lacks detachable cables. The circuit design, voltage stability, efficiency and noisiness of these models are identical. So if you want to buy a quiet PSU but find the MODU82+ too costly, you may be interested in the cheaper Enermax PRO82+.

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