Enermax Revolution 85+ ERV1050EWT (1050W)
The Enermax Revolution series was introduced to our readers in our earlier review. It is interesting for its good characteristics as well as technologies employed. Enermax claims this series incorporates all cutting-edge innovations ready for mass production, resulting in a progressive platform that will serve the company for the next few years.
The PSU comes in a big box with laconic design. The developer seems to suggest that this is a very serious product.
The PSU itself is designed in an original way, though. It is painted a rough (not just matte but really rough) gray paint and has a separate red plate around the fan. The edges of the case are rounded off. All of this makes the Revolution series different from standard PSUs.
Take note of the fan frame: its edges are rolled in to reduce the gap between the fan body and the PSU case. The manufacturer says this solution helps reduce the noise by 1-2dB.
Most of the cables are detachable. There are two rows of connectors in the PSU for them. Take note of the size and pin count of the connectors for graphics card cables (the red ones). You can attach two graphics card connectors to each, for a total of four top-end graphics cards. The PSU is equipped with the following cables and connectors:
- Mainboard cable with a 24-pin connector (58cm)
- CPU cable with a 4+4-pin connector (60cm)
- CPU cable with an 8-pin connector (60cm)
- Two graphics card cables with one 6+2-pin connector on each (59cm)
- Fan’s tachometer cable (60cm)
- Four connectors for additional graphics card cables
- Six connectors for additional HDD power cables
Included with the PSU are:
- Three graphics card cables with two 6+2-pin connectors (49cm)
- One cable with three Molex connectors (45+10+10cm)
- One cable with three Molex connectors and one floppy-drive plug (45+10+10+10cm)
- Four cables with four SATA power plugs on each (45+10+10+10cm)
So, there is a total of eight connectors for graphics cards (plus two more connectors on the PSU!) and 16 connectors for SATA drives. That’s rather too much for a home computer, but people who build powerful systems for GPGPU applications may be interested in this PSU.
I will refer you to the above-mentioned review for details about the circuit design features of the Enermax Revolution series. Here, I’ll just give you a few basic facts. The main regulator is based on two transformers working alternately: the PWM controller is sending impulses to one and then to another. This solves the problem of load balancing and allows to get any output power from 0 through 1050 watts from this PSU. The main regulator yields +12V only whereas +5V and +3.3V are produced by means of additional independent regulators residing on a card at the back panel of the PSU.
Funnily enough, the marking of the PWM controller is carefully rubbed out in my sample of the PSU although its name and operation should not be a secret for those who read our review of the 850W Revolution. You can also find them in an article published by Texas Instruments (the developer of the controller) a few years ago, so I don’t think that’s a secret for Enermax’s competitors, either.
The PSU can yield almost all of its 1050 watts of maximum output power via the +12V rail, so its effective output power equals its specification. That’s perfectly normal considering the circuit design: all of the PSU’s voltages are produced from +12V by means of additional regulators, so the +12V rail must have the same load capacity as the whole PSU.
Together with an APC SmartUPS SC 620 this power supply worked at loads up to 390W when powered by the mains and up to 350W when powered by the batteries. The UPS switched to its batteries normally and was stable. Thus, this power supply is compatible with UPSes with trapezoidal output voltage. And there will be no problems at all with top-end models with sinusoidal output.
Output Voltage Stability
The output voltages are almost ideally stable, deflecting no more than 4% through the entire range of permissible loads. Only one of our three reference configurations does not fit into the “green” zone. Enermax puts a special emphasis on the ability of this PSU to work under any load from zero to maximum. As you can see, the cross-load diagram is indeed built from zero along both axes.
Output Voltage Ripple
The output voltage ripple at maximum load is within the permissible limits and very low on the +12V rail.
The PSU is cooled with a 135x135x25mm fan from Globe Fan.
The fan starts out at a very modest speed of only 660rpm. The speed grows up at higher loads, but only reaches 1000rpm at a load of 700W or higher. Besides, the PSU has a rather agreeable noise spectrum, without any irritating tones, so it is comfortable enough even at full load and 1500rpm. Overall, the Revolution is a very quiet PSU.
Efficiency and Power Factor
The efficiency is very good: over 80% at any load from 100W and higher and 91% at the maximum. The PSU is as high as 87% efficient even at full load.
The standby source has a load capacity of 5A and copes with the job easily. The output voltage is higher than 4.9V, the allowable minimum being 4.75V.
The only problem I can find in the Enermax Revolution 85+ is that it is rather large. There are already many 1000W units that are 3-4 centimeters shorter. However, such high-wattage PSUs are not usually installed into compact system cases while in its other parameters the Revolution is one of the best models we’ve ever tested in our labs, offering stable voltages, high efficiency, quietness and a rich selection of cables and connectors. This PSU is going to be an excellent choice for a top-end gaming computer as well as for a workstation, including GPGPU platforms.