Articles: Cases/PSU

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The PSU is equipped with the following cables and connectors:

  • Mainboard cable with a 20+4-pin connector (42cm)
  • CPU cable with a 4+4-pin connector (45cm)
  • Fan’s tachometer cable (55cm)
  • Two connectors for graphics card cables
  • Six connectors for peripherals

Included with the PSU are:

  • Graphics card cable with a 6-pin connector (45cm)

  • Graphics card cable with a 6+2-pin connector (45cm; note that it is plugged into two sockets in the PSU)

  • Two cables with alternating SATA and PATA power connectors (two connectors of each type; 45+5+10+5cm)
  • Two cables with alternating SATA and PATA power connectors (two connectors of each type) and one floppy-drive plug at the end (45+5+10+5+25cm)

Thus, the PSU provides enough connectors for a system with one top-end or two mainstream graphics cards without adapters. The combined cables with connectors for both PATA and SATA devices are original, but they can only be useful for people who install old HDDs along with newer ones.

The Liberty DXX can yield only 70% out of its total output power of 500W across the +12V rail. Compare this to over 90% with the previous models. Anyway, the available 32 amperes is going to be enough for a single-chip graphics card of any level (up to GeForce GTX 280) and a dual- or quad-core CPU.

The PSU worked normally at loads from 15W through 478W during my tests. Together with an APC SmartUPS SC 620 it could work at loads up to 335W and 320W when powered by the mains and batteries, respectively. The pair switched to the batteries normally, and the UPS was stable then.

The output voltage ripple is within the norm.

As I wrote above, the main difference of the Liberty DXX from the Infiniti series is the lack of dedicated voltage regulation. The cross-load diagram shows the consequences: the +12V voltage sags under high load. As a result, you should not load the +12V by more than 300W: when the voltage sags more than 3%, some graphics cards may report a lack of power although the industry standard formally permits a 5% deflection.

The efficiency is low, reaching 81% only. This is not high for a modern PSU. At full load the efficiency even lowers to 78%.

Notwithstanding the relatively low efficiency, the PSU is quiet enough under low loads. The fan starts out at a speed of 900rpm, being almost silent then. At loads higher than 150W, the speed is growing up linearly, reaching 1800rpm. The noise is audible then but has a comfortable spectrum: it is just a hiss of the air without any sounds from the impeller, bearings or electronics.

Summing it up, the Enermax Liberty DXX500W is a good power supply for gaming computers with one graphics card (a single-chip card because the PSU may be not enough for dual-core solutions like the Radeon HD 4870 X2) and almost any CPU. Its high manufacturing quality, good electrical parameters and comfortable level of noise make it a good choice for people who don’t need higher wattages. And such users are the majority.

However, the Liberty DXX has got strong opponents: the newest series of Enermax PSUs that will be discussed in the next sections.

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