Asus ROG Strix 850W Platinum PSU Review UK 2026

The ASUS ROG Strix 850W Platinum is worth buying for a gaming or work PC that runs for long sessions and needs an 850W ATX supply. Its case rests on Platinum efficiency, modern power-delivery support and a useful modular cable set. Pay the premium when those features suit the build and the difference from a good Gold unit is modest.

For an occasionally used PC, Platinum is a weaker reason to spend more. A suitable Gold supply can be the better purchase if it leaves money for a more useful upgrade. The Strix also needs room for a 160mm chassis and its cable plugs.

There is one purchase detail to settle: ASUS advertises a ten-year warranty, while the recorded Amazon warranty field says three years. Get that clarified for part 90YE00W2-B0NA00 before ordering.

Those excursions last a fraction of a second. The Strix is still an 850W PSU: the graphics card, CPU, drives, pumps and fans all share that capacity, and sustained heavy work needs room within it. An 850W label also does not mean the computer continuously pulls 850W from the wall. An idle desktop and a long game session place very different demands on the same unit.

Start with the recommendation for your exact graphics card and account for the processor's configured power limits. A factory-overclocked card or a processor running unrestricted can change the requirement, and the newest ATX standard does not make one wattage right for every high-end combination.

At a 425W output load, the midpoint of an 850W supply, 92% efficiency means about 462W at the wall. At 94%, it means about 452W. That is roughly 10W less conversion loss in this illustrative calculation. It is useful, but it is not a dramatic reduction in the whole computer's electricity use.

The value builds with time. Someone running demanding work or games for many hours has a better reason to pay extra than someone using the PC briefly each evening. The actual saving depends on the unit's efficiency at those loads, operating hours and electricity tariff.

Cybenetics is a separate certification programme with its own methods. A Platinum label from each programme is useful information, but their criteria should not be mixed into a single efficiency claim. Nor does an efficiency badge settle voltage regulation, noise or build fit. Use it as one part of a purchase that already meets the electrical and physical requirements.

There are two 4+4-pin CPU connections, three 6+2-pin PCIe connections and one 16-pin graphics connection. The CPU and PCIe plugs serve different jobs even though both can look like eight-pin connectors. Follow the labels rather than the shape.

Six SATA and three peripheral connections cover the stated accessory inventory. Count lighting hubs and fan controllers as well as storage drives. A machine with only two drives can still use more power connectors than the drive count suggests.

The PSU-side pinout of modular cables is not universal, so leads from another supply are only safe to reuse when the manufacturer confirms compatibility with this exact model. Fully modular wiring has the opposite benefit too: unused leads stay in the box, and the case stays clearer for it.

With the system switched off and disconnected from mains power, push the connector fully into place until its latch engages. Inspect the joint for a visible gap and avoid pulling the cable sideways as you tidy it. The smaller sense contacts on the revised 12V-2x6 design help with connection detection, but they do not remove the need for proper seating.

Leave a straight section as the cable exits the plug, and check the connection again after routing, because tidying other leads can disturb it. A card that fits by its published width can still leave too little room for its power cable once the side panel goes back on. The native cable at least removes an adapter, and with it one more joint, from the route.

For a small case with a strict PSU limit, physical fit can settle the decision before efficiency does. Modularity reduces clutter, but it cannot shrink the cables the system actually needs, and plugging leads in before the unit goes into a tight bay is often easier than reaching them afterwards. The Strix belongs in an ATX build with room for its complete installed footprint; a shorter housing or a different form factor suits smaller cases better.

The 0dB button controls whether the fan can stop under suitable load conditions. Turn the mode off and the fan runs at all loads. A stopped PSU fan removes that fan's contribution during eligible light work, while CPU, graphics and case fans remain separate sources of sound.

For a quiet study or recording room, judge the supply through an independent acoustic test at the load you expect to use. A gaming PC that regularly draws substantial power spends less time in a fan-stop state than a machine doing light office tasks.

A long warranty is worth considering for a component that may stay through several upgrades. It still has conditions covering the buyer, region and claim procedure. Clear terms are more useful than guessing which of two conflicting numbers will be honoured. The listed electrical protections (over-power, over-voltage, under-voltage, short-circuit, over-current and over-temperature) are the standard set you would want covered by that warranty.

If the PC mostly sits at low load or runs only occasionally, the electricity saving may not repay a large premium. Put capacity, compatible wiring and fit first. The ROG badge should be the last reason to spend more, after the practical reasons already add up.