Corsair SF850 ATX v3.1 PSU Review

Box & Bundle

My review sample arrived in a plain carton box, but since I visited Great Wall’s production line in 2023, I had the chance to take a photo of the box, which I can share now. As you can see, there is no 80 PLUS badge, but only Cybenetics. Corsair decided to drop the 80 PLUS certification scheme because it is outdated and super-expensive and proceed with Cybenetics. They can invest the money they will save from this move on R&D and produce even better products. Just saying…

Product Photos

The dimensions are super-compact since this is an SFX unit, and it is good to see a punched fan grille with large perforations, which boosts airflow. The more restricted the fan grille is, the harder it is for the fan to get air, so it has to spin at higher speeds and produce increased noise.

The modular panel around the back hosts ten sockets. Instead of a native 12V-2×6 socket, Corsair uses 2x 8pin Micro-Fit sockets, which are more tolerant of abuse.

Cables

Modular Cables
Description Cable Count Connector Count (Total) Gauge In Cable Capacitors
ATX connector 20+4 pin (310mm) 1 1 16-20AWG No
4+4 pin EPS12V (410mm) 2 2 16AWG No
6+2 pin PCIe (400mm) 3 3 16AWG No
12+2 pin PCIe (410mm) (600W) 1 1 16-24AWG No
SATA (100mm+115mm+115mm+115mm) 2 8 18AWG No
4-pin Molex (100mm+115mm+115mm) 1 3 18AWG No

Don’t expect to find long cables in an SFX unit since they are destined for chassis with restricted internal space. Some could argue here, then, why the SFX-to-ATX adapter is included in the product’s bundled accessories. It is most likely included for users wanting to buy Corsair’s Type 5 standard cables to install this PSU into a regular ATX chassis. You should expect slightly lower efficiency and increased voltage drops with longer cables because of the increased resistance, especially at high loads. This is why many manufacturers send units for efficiency certification at 80 PLUS, with super-short cables. This cannot be the case in Cybenetics, where the above cable description table is included in all reports.

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