Articles: Cases/PSU

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The PSU offers the following cables and connectors:

  • Mainboard power cable with a 20+4-pin connector, 45cm long
  • CPU power cable with a 4-pin connector, 47cm
  • CPU power cable with an 8-pin connector, 46cm
  • Four screened graphics card cables with 6-pin connectors, 65cm
  • Screened cable with one Molex connector, 46cm
  • Two cables with three Molex connectors and one floppy mini-plug on each, 46+15+15+15cm
  • Two cables with four SATA power connectors on each, 46+15+15+15cm
  • Three cables with connectors for system fans, 66cm each. These are meant to connect external fans to the PSU’s integrated fan speed controller so that their speed would change depending on the PSU temperature. Besides, the fans are powered from the +5V standby source for a while after you shut down your computer, cooling the system case additionally.

The screening of the graphics card cables has no practical meaning because it does not affect the level of interference (these are power rather than signal cables, after all), but makes it difficult to lay the cables neatly in the system case. Moreover, these cables have ferrite rings to suppress high-frequency interference. In my opinion, the manufacturer should have limited itself to the rings only – this wouldn’t look so cool and unusual, but wouldn’t hinder the assembling of the system, either.

The PSU delivers very stable voltages. The diagram is mostly green. The +12V voltage is a little higher than necessary, by 2-3%, but this deflection is not critical in practice.

It is worse with the output voltage ripple at the maximum load. The PSU exceeds the allowable limit on the +5V rail (the limit is 50 millivolts or one division of the vertical axis) and is close to the limit on the +12V and +3.3V rails (120 millivolts and 50 millivolts, respectively). But unlike the Tagan unit, the TOP-1000P9 doesn’t have a strong low-frequency pulsation.

The PSU uses a 135x135x25mm Globe Fan RL4B S1352512HB fan with blue LED highlighting.

The fan speed changes but little at loads from zero to 600W and then begins to grow up quickly. Although the Topower is louder than the above-described PSU from Cooler Master (whose fan started out with a speed of only 830rpm), it is overall good through the entire range of loads and is surely quieter than models with 80mm fans. In fact, the TOP-1000P9 is the only serious rival to the Real Power Pro in terms of noise among all the PSUs tested here.

The PSU boasts a good efficiency of 85% which lowers to 82% at high loads. The PSU complies with the 80+Plus requirements at least in a 220V power grid: its efficiency is higher than 80% at 20% from max load (200W).

So, the only real disadvantage of the Topower PowerTrain TOP-1000P9 U14 is that its output voltage ripple is higher than allowable at full load. The ripple is lower at lower loads, though. Otherwise, this is a good product, with high efficiency, stable output voltages, and moderate noise level. The last thing is especially important since there are only two PSUs among the tested ones, namely the Topower PowerTrain and the Cooler Master Real Power Pro, that are quiet enough for a home computer.

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