Tuniq Ensemble PSU-ENS-1200W (1200W)
Tuniq is another debutante in our PSU reviews.
Tuniq’s product comes in a box that can be easily carried in a plastic bag, but not handy otherwise: it is very large, flat and handle-less.
The exterior design resembles the Chieftec CFT-1200G-DF which I reviewed recently. The similarity goes from the overall component layout to the sticker informing you that the fan is going to rotate for a while after the PSU shuts down.
The Ensemble is equipped with fixed cables. Its cables go out of the two holes in the back panel, but this can hardly affect the ease of assembly.
We’ve got the following cables here:
- Mainboard cable with a 24-pin connector (56cm)
- CPU cable with a 4+4-pin connector (56cm)
- CPU cable with an 8-pin connector (58cm)
- Two graphics card cables with one 6-pin connector on each (57cm)
- Two graphics card cables with one 8-pin connector on each (57cm)
- Two cables with three SATA power connectors on each (46+15+15cm)
- Two cables with three Molex connectors and one floppy-drive plug one each (47+15+15+15cm)
- Fan’s tachometer cable (61cm)
The connectors are rather scanty for a 1200W power supply. Without adapters you can only attach two top-end graphics cards and some six SATA drives. If that’s enough for your configuration, you can hardly want a 1200W PSU. And if that’s not enough, most of alternative products offer more connectors (three pairs for graphics cards and 8 to 12 SATA plugs, as a rule). Besides, the Ensemble’s cables are not long.
The internals confirm my supposition that this PSU is a kinsman to the Chieftec CFT-1200G-DF as it is made by Sirtec and is no different from Chieftec’s model in interior design.
The drawback of the component layout is that the input filter resides at the vent grid. The filter does not need much cooling but its chokes will hinder the air flow. Is it the reason why the developer had to install a second, 80mm, cooling fan?
The PSU has typical specs for its class. There is nothing that might catch your eye here. The combined maximum load on the +12V rail is exactly equal to the load capacities of the four “virtual” output lines. It means that each line must be loaded to its full for the PSU to deliver the promised 1080W via its +12V rail. In most other PSUs the sum of the load capacities of the individual lines is higher than the total load capacity, which allows to distribute the load among the lines in a more flexible way.
The PSU is practically incompatible with UPSes. Switching to the batteries makes the UPS shut down reporting overload even a load of 300W. It is only online UPSes, which do not have to switch to batteries at all, that can be used with such power supplies.
Output Voltage Stability
The PSU boasts exceptional stability of the output voltages, none of which goes out of the prescribed range at any load. The only downside is that it would shut down if the load was suddenly dropped from maximum to 10W or lower on the +12V rail. Anyway, I guess that a computer configuration that calls for a 1200W power supply will surely have an idle power consumption of over 10W despite all the newfangled power-saving technologies.
Output Voltage Ripple
The high-frequency ripple is within the acceptable range at full load. The shape of the ripple is smooth, without any spikes.
Besides, there is low-frequency ripple (at the double frequency of the mains, i.e. 100Hz) on the +12V rail. The sum of the high- and low-frequency pulsations is within the acceptable limits, too. But the very existence of the low-frequency component is not good.
The PSU is cooled by two fans, both manufactured by Globe Fan. The main fan measures 135x135x25 millimeters.
The second fan, measuring 80x80x15 millimeters, features cavities in the blades typical of some Globe Fan models. The developer says these cavities are designed to improve aerodynamic and noise characteristics of the fan.
Alas, it is the 80mm fan that was the main problem. It produced a soft but distinct noise even at minimum loads.
The fan speed management is designed in a queer way. The fans both speed up at a load of 750W. As a result, the PSU is somewhat worse than average in terms of noisiness until that load (mostly due to the 80mm fan because the 135mm fan is rotating rather slowly and is almost silent) but becomes noisy after it.
Efficiency and Power Factor
The PSU’s efficiency is not record-breaking, but good. It is almost 89% at the maximum and 81.5% at full load.
The standby source’s voltage is rather high at zero load (5.2V while the allowable maximum is 5.25V) but bottoms out to only 4.91V at full 6 amperes, which is much higher than the allowable minimum.
Although the Tuniq Ensemble PSU-ENS-1200W is not a bad power supply, it is inferior to most of its opponents. The Ensemble is bulky, has too few cables, is incompatible with UPSes, and is cooled with two fans, the smaller of which would produce a distinct noise even at low loads. Finally, its habit of shutting down when the load on the +12V rail is suddenly dropped to below 10W may be a problem for configurations with especially effective power-saving technologies.