Articles: Cases/PSU

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Enermax NAXN ENM850EWT

Lacking any special features, the NAXN series doesn’t stand out among Enermax’s products. We’ve got the most advanced and highest-wattage model, ENM850EWT, which has modular cables and 80+Bronze certification, but neither feature is something special nowadays.

The 750W model is actually the only one in the NAXN series to have the mentioned features. The rest of them, ranging in wattage from 350 to 600 watts, have non-modular design and basic 80+ certification at best. The two junior models even lack active PFC.

It is because the ENM850EWT comes from such a lusterless series that we want to cover it in this review. Otherwise, its price and wattage are higher than those of the other products tested here.

The ENM850EWT comes in a medium-sized glossy cardboard box which is the same for the two senior models of the NAXN series.

Besides the PSU, the box contains a pouch with manufacturer’s logo to keep the detachable cables in.

Exterior Design

There’s nothing unusual in the exterior design of this product. We see a cute combination of a black case and a golden wire grid of the fan. The back panel is a honeycomb mesh.

The other side panels are blank, lacking any vent holes.

Circuit Design

Enermax is known for original solutions but this particular product doesn’t come from a top-end series. Anyway, it features dedicated voltage regulation based on magnetic amplifiers: there are three rather than two chokes in the output circuitry area.

There are two small daughter cards installed on the main PCB. The one closer to the center carries a PWM and PFC controller.

The other, which is closer to the edge, carries a monitoring chip PS224.

The electrolytic capacitors at the output are manufactured by Teapo; a large one from Rubycon is installed at the input.

Cables and Connectors

The Enermax NAXN ENM850EWT is equipped with the following cables and connectors:

  • One mainboard cable with a 20+4-pin connector (56 cm)
  • One CPU cable with a 4+4-pin connector (62 cm)
  • One CPU cable with a 4+4-pin connector (63 cm)
  • Two graphics card cables with 6+2-pin connectors (62 cm)
  • Two connectors for graphics card cables
  • Four connectors for peripheral power cables

Included with the PSU are:

  • Two graphics card cables with two 6+2-pin connectors on each (55 cm long to each connector: the cable splits into two 10 centimeters before the connectors)
  • One cable with three PATA power connectors and one floppy-drive plug (45+10+10+10 cm)
  • One cable with two PATA and two SATA power connectors (45+10+10+10 cm)
  • Two cables with four SATA power connectors on each (46+10+10+10 cm)

The selection of connectors is sufficient. The main cables are long enough but the connectors of the peripheral cables are placed rather too close to each other.


You can see that the NAXN ENM850EWT is not a very advanced PSU by looking at its specs. It can yield 100 watts less than its full load across the +12V rail, which is not typical of today’s top-end PSUs. The load capacity of the +3.3V and +5V rails is exceedingly high by today’s standards at 180 watts. This is 3 or 4 times as high as a modern computer actually needs.

The peak output power is declared to be 10% higher than the continuous one for this PSU series. It means 935 watts for the NAXN ENM850EWT model.

The PSU features 80+Bronze certification which guarantees 82% efficiency at 20% and 100% load and 85% efficiency at 50% load.

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