We would like to thank Rosewill for supplying the review sample.
Rosewill is not new to the Platinum-efficiency club since they already have a high efficiency series with their Fortress line-up; however, that series only includes PSUs of low to medium capacity without a modular cabling design in an attempt to keep it affordable and to attract the budget-oriented user without a vested interest in such features. Nevertheless, most users nowadays highly prefer modular PSUs to non-modular ones, which gave Rosewill additional incentive to include a high-end PSU in their offerings. So they co-operated with Super Flower to present the Tachyon series which does, in essence, consist of rebadged Super Flower Golden King PSUs. We have already reviewed many Platinum Super Flower PSUs in the past, so we are aware of their top performance, but this will be the first time that their high-end platform confronts our Chroma loaders.
The test subject of today's review will be a Tachyon with 1000 W capacity, which is the flagship model of not only the homonymous series, but of Rosewill's entire PSU portfolio. This unit features a powerful single +12V rail, goes fanless at lower loads, and is equipped with modular cables that, amongst others, include six PCIe and two EPS connectors, so it can handle up to three high-end VGAs and a server mainboard with two installed CPUs. The big Tachyon does, according to Rosewill, utilize a silent fan which, thanks to its auto fan speed control, operates with the lowest possible noise-output once engaged. Well, we will see about that given we already started taking noise measurements through the fan-speed data we gather in every other review. We should note that taking noise measurements during PSU testing is not that easy while the ultra-noisy Chromas is operating, and we had to devise a rather simple, but at the same time ingenious, method to be able to accurately evaluate the output noise of the PSU under testing conditions.
Rosewill Tachyon 1000W Features & Specs
Max. DC Output
80 PLUS Platinum
0°C - 50°C
Over Voltage Protection Under Voltage Protection Over Current Protection Over Power Protection
140 mm Sleeve Bearing Fan (RL4Z S1402512HH)
150 mm (W) x 86 mm (H) x 180 mm (D)
ATX12V v2.31, EPS 2.92
Price at time of review (exc. VAT)
The PSU carries the highest efficiency certification with 80 Plus Platinum, and the maximum operating temperature at which it is able to deliver its full power continuously is 50°C. Its protection features include everything except the crucial OTP (Over Temperature Protection), but such a wide operating temperature range does, thankfully, make OTP a little less useful to this Tachyon.
The fan has a 140 mm diameter and is, unfortunately, not equipped with ball-bearings, but with a plain sleeve bearing that doesn't last nearly as long. We expected a fan of higher quality to be used with such an expensive unit.
The unit's dimensions are larger because of the components needed to output 1 kW, but nearly any chassis available on the market should be able to accommodate this PSU since its length, although bigger than the normal 160 mm, isn't that much longer; that is, at least compared to monstrous PSUs like the Silverstone ZM1350.
Strangely enough, Rosewill states that this unit is ATX 2.31 compliant, although this doesn't stand since the latter spec requires at least two +12V rails and the Tachyon 1000 W only has one. However, this is nothing to whine about, and they probably filled this section of their PSU's specifications out in a hurry without priorly researching it properly. Finally, the warranty is five years long, which is a sufficient period for a high-end PSU, and its price tag is close to the Kingwin Lazer Platinium 1000W - one of its direct contenders.
Rosewill Tachyon 1000W Power Specs
Total Max. Power
The single +12V rail is powerful since it can almost deliver 1 kW. It will easily handle every system equipped with a three way SLI or Crossfire configuration. The minor rails, on the other hand, look weak with 100 W max combined power, but there is nothing to worry about since a contemporary PC won't draw more juice out of those two rails. This is why they are called minors, after all. Finally, the 5VSB rail can deliver up to 2.5 A, which looks like very little if we take into account the high capacity of this unit. A 1 kW unit should normally deliver >3A on this rail.
Six PCIe and two EPS connectors are available at the same time, something common in most 1 kW PSUs. The number of available SATA connectors is sufficient for the category of the unit and the same applies to the number of the peripheral connectors.
The length of all cables should not cause compatibility issues with a large full-tower chassis, and the distance amongst connectors is good. Finally, the longer EPS cable uses thicker 16AWG gauges for lower voltage drops and the same applies to the wires that deliver +12V and earth to the main ATX connector. All the other connectors use the normal 18AWG wires.
Since this PSU features a single +12V rail, we do not have anything to comment on about its power distribution.
The Tachyon comes in a sturdy cardboard box with a carrying handle on top. The box's graphics design is nothing to write home about, and most of the front's real estate is occupied by a photo of the PSU with the fan-grill in the foreground. On the left side are badges for the unit's Platinum efficiency, the five-year warranty, and its modular cables, along with a description of the series and its capacity. The sides of the package only have an illustration of the series' name and Rosewill's logo.
A brief feature list with descriptions, a table of available connectors, and four more tables giving the power specifications on all Tachyon PSUs can be found on the rear side of the package. There is also an over-sized Platinum efficiency badge on this side; just to show off the high efficiency of the unit.