Articles: Cases/PSU

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It is equipped with the following cables and connectors:

  • Mainboard cable with a 20+4-pin connector (44cm long)

  • CPU cable with 8-pin and 4-pin connectors (46+20cm)

  • Graphics card cable with two 6+2-pin connectors (45+20cm)

  • One cable with three Molex connectors (45+15+15cm)
  • One cable with three Molex connectors and one floppy-drive plug (45+15+15+15cm)

  • Two cables with two SATA power connectors on each (45+15cm)

There are obvious improvements over the A-55AG: two SATA cables and universal 6+2-pin connectors for graphics cards. A modern configuration can be connected to this PSU without any adapters.

The load capacity of this PSU doesn’t differ much from that of the A-55GA. The allowable load on the +12V rail is the same 360W, so the total effective output power of this PSU, i.e. the power it can yield considering the typical distribution of load among the different power rails, is about 400 watts.

The PSU worked without problems at loads up to 527W in my tests.

Together with an APC SmartUPS SC 620 the PSU could work at loads up to 410W when powered by the mains but was not stable when powered by the batteries (the UPS reported overload and shut down after 10-15 seconds of battery operation even at a load of 200W).

The output voltage ripple is within the permissible limits at full load.

The cross-load diagram is not a very pretty sight. The +12V voltage goes through the entire range of allowable values from 11.4V to 12.6V. Thus, this PSU should not be loaded by more than 250-300W. Anyway, even with this limitation the P-55GA can power up a gaming system with a mainstream graphics card whose power draw is not higher than 100W. The PSU will have a sufficient reserve of output power then.

The PSU is just as efficient as the previous model, reaching 83% at one point of the graph. But its average efficiency is about 80%. That’s a normal result as today’s PSUs go.

The fan is rotating at a constant speed of about 1150rpm at loads up to 300W. Its noise is within comfortable limits then. The A-55GA and P-55GA are similar in terms of noisiness. The former is quiet under low loads while the latter sounds more agreeable at medium and high loads.

Summing up, I can tell you that the P-55GA differs from the A-55GA with the cables: its selection of cables and connectors suits a modern PC better. The rest of the differences are insignificant. Both PSUs offer an effective output power of 350-400W. Both are average in terms of noisiness and have low stability of the output voltages. The P-55GA was only much inferior to the A-55GA in the UPS test.

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