Articles: Cases/PSU

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It offers the following cables and connectors:

  • Mainboard cable with a 24-pin connector (45cm)

  • CPU cable with a 4+4-pin connector (54cm)
  • Graphics card cable with a 6+2-pin connector (53cm)
  • Fan’s tachometer cable (62cm)
  • Two connectors for graphics card cables
  • Six connectors for power cables of hard and optical drives

Included with the PSU are:

  • Three graphics card cables with 6-pin connectors (45cm)
  • Additional CPU cable with a 4-pin connector (45cm)
  • Three SATA power cables with three connectors on each (45+15+15cm)
  • Three cables with three Molex connectors on each (45+15+15cm)

Funnily enough, the PSU has two graphics card connectors but there are three cables included with it. You have one spare cable! As a matter of fact, you can connect only one top-end graphics card to this PSU without adapters because it offers only one 8-pin (6+2) plug. Of course, its wattage is high enough even for two cards. The problem is in the connectors only.

The PSU can yield over 93% out of its total output power of 720W across the +12V rail which is split into three “virtual” lines (although the manufacturer talks about three independent +12V power rails in the marketing materials, this is not really so; there is only one 56A +12V power rail inside the PSU). Each of the three graphics card cables is assigned to a specific +12V line. The CPU cable is attached to the 12V2 line, sharing it with one of the detachable graphics card cables and some HDDs.

The PSU worked normally at loads from 20W to the maximum. It had no problems at low loads. Together with an APC SmartUPS SC 620 this power supply worked at loads up to 365W and 335W when powered by the mains and batteries, respectively. They switched to the batteries without problems, and the UPS was stable at that.

The high-frequency output voltage ripple is far lower than the permissible maximums on every power rail. And there is no low-frequency pulsation altogether.

The +12V voltage is very stable but somewhat higher than the nominal value. That’s why its diagram is mostly yellow. There is nothing wrong in this: the 3% deflection won’t affect the operation of your PC. The +3.3V voltage is stable, too. The +5V voltage sags heavily at loads higher than 100W on the +5V rail, but the +5V load is not going to be higher even than 50W in a real PC, so there is nothing to worry about here, either.

Although Enermax declares an efficiency of 82% for the Infiniti series and 85% for the Galaxy DXX, the Infiniti is 1% better according to my test, reaching a maximum of 86%. There is a sudden slump in the left of the graph because I started to measure from as low as 25W.

As you remember, the Galaxy DXX is not quiet due to the additional 80mm fan. The Infiniti has no such fan whereas its main 135mm fan is the same as in the Galaxy DXX.

Alas, the Infiniti is not quiet, either. Its main fan is the same, but faster, rotating at 1050rpm at minimum load. As a result, the PSU is average in terms of noisiness. Most users are going to be satisfied with it, but it won’t suit people who prefer silent computers. Moreover, one of its chokes produced a buzzing sound at loads higher than 300W, but I guess it was a defect of the particular sample rather than of each PSU in the series.

Considering that 720 watts is far enough for the majority of modern gaming computers (with a single Radeon HD 4870 X2 which consumes up to 260W or with two less advanced graphics cards), the Enermax Infiniti 720W seems to be a more interesting offer than the bulky Galaxy DXX which is incompatible with low loads.

The Infiniti will suit an advanced gaming configuration, even with top-end CPU and graphics card models, because it offers high output power and stable voltages. Its fan is somewhat noisier at low loads that we might wish, but you should consider Enermax’s PRO82+ and MODU82+ series (tested later in this review) if you seek for silence.

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