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FSP Aurum CM AU-650M and AU-750M

I will review the two next PSUs together since they are similar and belong to the senior branch of the Aurum family that ranges from 550 to 750 watts.

The box is not much different from the packaging of the ordinary Aurum in design but larger. The main difference of the Aurum CM line from the Aurum is mentioned on the box. It is Cable Management or detachable cables.

The various advantages of the product are again listed on the back of the box. They range from indisputable (like the efficiency of over 90%) to dubious (like the intricately shaped vent grid) and downright incomprehensible (Hybrid Synergy 12V Rail Design; as I’ve found out, the Aurum has formal separation of the 12V power rail into multiple output lines but it never shows up in practice). All of this has been discussed above in my description of the AU-700 model. I can see only two differences so far. The Aurum CM units have detachable cables which are also flat. You'll see shortly what I mean by that.

Besides the PSU proper, the box contains a power cord, a user guide, screws, a cable strap, and a sticker for your system case.

The Aurum CM series looks the same as the Aurum except that the case is somewhat longer. The exterior design is beautiful: a black case with a rough surface, a golden decorative piece above the fan, an originally shaped fan grid, and the arrows of the vent grid in the side panel. I'd replace the arrows with something less beautiful but more transparent for the air, though.

The connectors for detachable cables can be found on the back panel. You can’t connect anything wrong because they differ in shape.

Inside, we can see the same circuit design with almost the same components as in the ordinary Aurum. The only notable difference is the second PCB with connectors at the back panel. It is to accommodate the additional PCB, which doesn’t carry anything besides the connectors, that the case has been made longer.

This is a modern PSU whose high efficiency helps it do with small heatsinks. There are a lot of surface-mounted components on the reverse side of the PCB, so its top side looks kind of empty, carrying but large components that cannot be surface-mounted.

The PSU employs FSP-branded chips which, as I explained above, are not simply rebranded chips from some other maker. The reasons for producing such custom-made chips show up when they are ordered in large quantities, but I have no doubt that FSP produces power supplies in large batches.

Take note of the marks to the left and above the chip. They indicate that this platform is meant for wattage ratings of 350 to 800 watts. So, we can expect the Aurum series to be extended both ways. Or there may appear inexpensive low-wattage PSUs under other names but based on this platform.

As opposed to the Aurum, the Aurum CM really uses Japan-made capacitors, the KZE series from United Chemi-Con. This fact will hardly affect the operation of the PSU, though.

The PSU is cooled with the same 120mm 2400RPM Protechnic Electric MGA12012HF-A25 fan running on a fluid dynamic bearing.

The PSU is equipped with the following cables and connectors:

  • Mainboard cable with a 20+4-pin connector (55 cm)
  • AU-650M has one CPU cable with one 4+4-pin connector (55 cm)
  • AU-750M has one CPU cable with one 4+4-pin and one 8-pin connector (55+10 cm)
  • One graphics card cable with two 6+2-pin connectors (55+10 cm)
  • One connector for a second graphics card cable
  • Four connectors for peripheral power cables

Included with the PSU are:

  • One graphics card cable with two 6+2-pin connectors (55+10 cm)
  • One cable with three SATA power connectors (55+15+15 cm)
  • One cable with two SATA and two PATA power connectors (55+15+15+15 cm)
  • One cable with two SATA, two PATA and one floppy-drive power connector (55+15+15+15+15 cm)
  • One cable with one SATA and one PATA power connector (55+15 cm)

There is nothing I can find fault with except that the CPU cable shouldn’t have been shortened to 55 centimeters but left as long as 65-70 centimeters in the models with wattage ratings below 700 watts. The 55cm CPU cable may prove to be too short in most system cases with a bottom PSU compartment unless you use adapters and extenders.

The fixed cables have nylon sleeves. The detachable ones are decorated more originally:

They are flat and have a casing that resembles heat-shrink tubing but is much more flexible. As a result, the cables are compact, flexible and can be easily laid out anywhere in the system case.

Each of these two models has four “virtual” +12V lines but this never shows up in practice. Each behaves as if it has a single +12V power rail and doesn’t shut down when one of the +12V output lines gets overloaded.

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