Asus ROG Strix 850G Aura PSU (850 W)
It gives a very good first impression. The design of the housing is something that sets this Asus ROG Strix 850G Aura PSU apart from the rest. Besides the above-standard dimensions, which suggest that it could be “rich” inside as well, there’s also a rather sophisticated cover or grille, and in line with aesthetic trends, there are also ARGB LEDs. What remains to be seen is what form the main thing will take – the electrical characteristics.
From the outside…
The housing is distinctive in its basic features in that its grille extends over the front with the fan. The heavily perforated sheet metal used to construct the grille is angled at right angles to the sides. So that it also extends into the longer sides of the power supply. Partially, at 50%. And even here it only fulfills a decorative role, since the side panels are impermeable, made of solid sheet metal.
The open part of the grille is only in front of the fan rotor. With its potential it is perhaps a bit of a shame, but maintaining high sturdiness was a priority. And the structure is really sturdy also due to the 1.5-millimeter sheet metal.
However, because of the grille structure with extremely thin walls between the hexagonal cutouts, we assume that cooling could still be above standard. Especially in combination with the 135 mm fan. To what extent Asus was also interested in psychoacoustic optimizations and the interplay between the fan and the grille used, you’ll find out later from the frequency analysis of the sound.
Up to half load, cooling can be passive. But it doesn’t have to be (and the fan could always turn on). Depends on whether you select the “0 dB” mode with the button on the rear panel.
At 180mm, the Asus ROG Strix 850G Aura is the longest power supply we’ll test (the BeQuiet! Dark Power 13 is 5 mm shorter). On the one hand, compatibility is slightly worse due to the extra dimensions, but there is also more space for components, which in turn can have a positive effect.
The test variant with a claimed power of 850 W has a permanent load capacity of 70.8 A on the 12 V rail on the label, which in a gaming load is enough for the Intel Core i9-13900K processor with a GeForce RTX 4090 graphics card.
The 16-pin 12VHPWR connector is built for 600 W (50 A) and in order to keep the transient resistance (i.e. the critical variable that increases the internal temperature) as low as possible, some really big hollows are used. That is, ones that are in contact with a large surface area with individual pins on all four sides. And the larger the contact area, the lower the transient resistance and the lower the temperature for the same electric current.
The cabling implementation is notable. The individual wires have a kind of “rubber” sheath with a wrinkled surface and are soft, they are good to work with. The advantage over conventional cables (both flat and those in a shared mesh) is in the easier adjustment of both thickness and width to the particular needs of the specific space through which they are routed.
Asus has four “Aura” (with backlit ROG graphic logos) power variants, 750, 850, 1000 and 1200-watt. These are also available in simpler, shorter models without lighting. All Asus power supplies with ATX 3.0 support have an 80 Plus Gold efficiency rating.
… and from the inside
Removing the cover is a little more complicated than normal, but you will definitely be able to do it. As usual, you need to loosen the four screws on the front (the ones holding the grille) and then the other four screws on the smallest walls at the front and back, which attach the fan mount to the rest of the structure. The fan is in the 135 mm format. Preventing a half-size larger fan from fitting inside are the light-conducting panels with foam inserts, which reduce the available space.
The PCB of the power supply uses the entire length and is also fitted with a relatively high density. Only later test results will show how good an electrical design this is.
But we can point to the rather rare capacitors in the primary, the (420 V/470 µF) Toshin Kogyo models. The secondary is already dotted with the frequently used “Nichicons”.
* The number of PCI Express connectors is given as the sum of native and shared connectors (the second number after the “+” sign). Native connectors are those that are the same on both sides. Shared ones are then connected via different connectors on the power supply side, for example, a single 300-watt 16-pin (12VHPWR) is created by using two 6+2-pin connectors, and vice versa – a 16-pin connector can be used to connect a cable with two 6+2-pin connectors.
English translation and edit by Jozef Dudáš