Articles: Cases/PSU

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FSP FSP300-60THN-P (300W) and FSP400-60THN (400W)

These two units (the snapshot above shows the FSP300-60THN-P, but the 400W model looks exactly the same) bear a strong resemblance to the earlier-described PSUs of the PN(PF) series, but these two belong to the latest version of the standard, namely ATX12V 2.0.

The units are almost identical inside, like the PN(PF) pair again. But on a closer examination you can note certain differences in the placement of the components. The two models differ mainly in the ratings of the elements employed and have absolutely the same PCBs.

The junior model of the two is equipped with a passive PFC device, while the senior model has none (but it may come with a passive PFC, too). As for other and less conspicuous differences, the 400W model has higher-capacity capacitors on the input of the inverter (1000µF against 820µF), a larger line-filter throttle and an additional diode pack on the bottom heatsink that ensures the necessary load current on the +12V rail. Here, the 300W model has one diode pack on this rail, while the 400W model has two packs in parallel.

The FSP300-60THN-P has surprisingly short cables:

  • A 32cm cable with a 24-pin connector for the mainboard
  • A 30cm ATX12V cable
  • Two cables with two Molex connectors on each (25cm from the PSU to the first connector and 15cm more to the second one). One cable also carries a floppy mini-plug (15cm more of length)
  • One 25cm SATA power cable

As you see, this PSU will only suit for small- or average-size system cases. If you’ve got a large case, the cables may prove to be too short. Fortunately, the cables of the FSP400-60THN are longer: the ATX and ATX12V cables are about 50cm long, the peripheral power cables are about 40cm to the first connector and 20cm more to the second one. Unfortunately, the 400W model also has just a single SATA power cable which is obviously insufficient for modern systems.

The regulator is located on a small card installed perpendicularly to the main card. It is based on a chip marked as FSP3529. The fan-speed regulator is also implemented on a separate card, and these cards of the two PSU models are identical.

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