Articles: Cases/PSU

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FSP ATX-300GTF (300W) and ATX-350GTF (350W)

These two units are presently the two juniors in FSP Group’s product line-up. They are almost identical both internally and externally, so the snapshot above shows the 350W model only. The 300W one outwardly differs with the label alone.



The PSUs are designed in the traditional way with one main regulator (it’s based on the FSP3528 chip that seems to be a standard PWM controller remarked for FSP) and an auxiliary regulator on the +3.3V rail. The 300W and 350W models only differ in the ratings of some elements. For example, the former has 680µF capacitors on the input of the high-voltage rectifier, while the latter has 820µF capacitors there. The fan speed control circuits also differ. In both models, however, this circuit resides on an independent card fastened to the heatsink with the diode packs so it’s not impossible to equip the ATX-350GTF with the speed-control circuit like the one shown on the snapshot of the ATX-300GTF and vice versa. The type of the installed card probably depends on the PSU production date and/or availability of particular parts at the factory storehouse.

The PSUs are equipped with a three-section line filter (although a simple two-section filter is commonly thought sufficient for a computer power supply) and a passive PFC throttle. Each PSU has such cables:

  • A mainboard cable with a 20-pin connector (about 50cm long)
  • An ATX12V cable with a 4-pin connector (about 50cm, too)
  • Two cables with two Molex connectors and one floppy mini-plug on each (40cm from the PSU to the first connector and 20cm more to each next connector)
  • One cable with two Molex connectors (40cm to the first connector and 20cm to the second one)
  • One 52cm cable with one power connector for a SATA drive
  • One 52cm cable with an additional power connector (AUX, it’s a 6-pin connector that resembles connectors of old AT power supplies; it is rarely used nowadays)

The wires all have a 12AWG section (about 0.8 sq. mm) and are bound together with nylon ties.

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