Articles: Cases/PSU

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InWin IP-P300AQ2-0 (300W), IP-P350AQ2-0 (350W), IP-P400AQ2 (400W)

I have reviewed power supplies from InWin on our website before as they are quite popular among the users. InWin offers not only PSUs but also inexpensive, yet good quality, system cases. However, in my last article devoted to In Win PSUs I regretted the fact that the firm shipped its modern ATX12V 2.0 models only as boxed products while the system cases still came with outdated ATX12V 1.3 power supplies.

And at last InWin’s product line-up has been complemented with low-wattage (staring from 300W) PSUs complying with the ATX12V 2.0 standard and selling both in system cases and separately.

The first three models with similar names and an identical platform will be reviewed all together.

The PSUs have an ordinary gray case with a wire grid of a 120mm fan. The mains voltage switch indicates that these models lack active PFC. By the way, they may come without such a switch. Its place is sealed then and the PSU only supports an input voltage of 200-240V.

The circuit design is quite normal for today, with an UC3843B PWM-controller and a TNY276PN-based standby source. The PSU doesn’t have PFC (there is no place left even for a passive PFC device) or dedicated voltage regulation.

You can see that the PCB of the 400W model is no different. The PSUs belong to the same series and share the same circuit design except that the capacitors in the higher-wattage unit are a larger size and capacitance.

I can find no fault with the assembly quality. Everything is simple but neat here.

The junior model indeed complies with the ATX12V 2.0 standard although the allowable load on the +12V rail is somewhat lower than described in the standard (20A against 22A). That’s a negligible difference, though.

The same goes for the 350W and 400W models. These PSUs comply with the ATX12V 2.0 standard as well, but the allowable load on the +12V rail is somewhat lower than recommended. Take note that the allowable load on the +12V rail grows up along with the overall wattage of the PSU whereas in the previous, ATX12V 1.3, generation of InWin PSUs, e.g. in the AJ series, that load was 18A irrespective of the overall wattage.

Each of the three PSUs has the same set of cables and connectors:

  • Mainboard cable with a 20+4 connector (35cm long)
  • CPU cable with a 4+4 connector (34cm)
  • One cable with a 6-pin connector for a graphics card (45cm)
  • One cable with two Molex connectors and one mini-plug for a floppy drive (26+14+15cm)
  • One cable with three Molex connectors (45+15+15cm)
  • One cable two SATA power connectors and one Molex connector (45+15+15cm)

The cables are tied up with nylon straps.

It’s good that even the 300W model has a graphics card connector and two SATA connectors, yet still I’d want to see at least four SATA plugs and on two separate cables. The cables are not long, but that’s rather an advantage for small and medium system cases.

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