Corsair HX850 850 W Full Modular 80 Plus Platinum 135 mm Fan ATX Power Supply Unit - Black

Product Information

A couple of the polymer capacitors are supplied by Nichicon, ensuring that only capacitors from Japanese companies can be found in the HX850. The Corsair HX850 is a simple looking, yet effective monochome power supply which will cleverly fit into any colour scheme of build you can think of. They have been the OEM behind nearly all the HX series units to this date, with the exception of a few Seasonic designs many years ago. Under max load, the Corsair HX850 has better DC output quality than most power supplies do at minimal loads. The HX850 is a high performance power supply, offering a dead silent operation under all conditions.

We do believe that Corsair will soon start bundling the Type 4 cables with its HXi series as well, though, to close this strange performance gap. The tests performed are based around six conceivable setups that are out there and progressively load down the PSU up to the power supply's limits or 1000W, whichever comes first. It uses a fluid dynamic bearing and has a low maximum speed, so even in worst-case scenarios it doesn't make much noise.

The bump from 80Plus Silver to Gold was very nice to see and the unit does a great job showing the increased efficiency. There is a switch in the back of the HX850w that allows you to switch between single and multi rail. The irony is Corsair used Seasonic's platform for a lot of their earlier HX and AX series PSUs so your HX620 may in fact be a Seasonic platform. The HX series is the second top-of-the-line PSUs from Corsair that, previously, met only the 80 PLUS Silver certification. This is the third revision of the 850-Watt HX unit, which was initially released with the first revision back in 2009.

The front of the packaging gives us our first look at the unit as well as wattage, warranty, and 80Plus information. Paintwork is deep and it proves difficult to scratch – this is more important than you think, as I have had power supplies mark very easily, simply by sliding them into the recess inside a new case. The heatsinks of the HX850 are relatively small, even for an 80 Plus Platinum certified power supply. CORSAIR HX series power supplies give you extremely tight voltage regulation, quiet operation, Platinum-certified efficiency, and a fully modular cable set. Over the last 15 years I've gotten about 35-40 years or so of run time over 7 or 8 different PSUs in my personal computers.

Main Desktop: CPU - i9-14900k | Mobo - Gigabyte Z690 Aorus Elite AX DDR4 | GPU - ASUS TUF Gaming OC RTX 4090 | RAM - Corsair Vengeance Pro RGB 64GB 3600mhz | AIO - H150i Pro XT | PSU - Corsair RM1000X | Case - Phanteks P500A Digital - White | Storage - Samsung 970 Pro M. There are a total of two ATX 4+4, six PCI-E, 12 SATA and 12 Molex connectors available with the inclusion of two adapters to go from Molex to FDD. The original HX520W and the HX620W are now but a distant memory, yet the HX series is still targeted towards demanding PC enthusiasts, consisting of eight high output (750-1200 Watt) units with very impressive specifications. To utilize the second ATX 4+4 connector, you will have to give up one of your PCI-E connectors and possibly the ability to utilize triple GPU's.

However, we cannot say the same for the distance between SATA and peripheral connectors, which is too small.Over-voltage protection, under-voltage protection, short circuit protection, over power protection, and over temperature protection provide maximum safety to your critical system components. The 135 mm fan responsible for the cooling needs of the HX850 is the Corsair NR135P, a fan we frequently see in the company’s high-performance PSUs.

Corsair manufacturers the HX850 with both native and modular cabling, all of which is fully sleeved or of the flat ribbon type.They also are one of the most influential companies, frequently introducing new platforms, upgrades, and innovative technologies. Review photography handled in house at KitGuru with a Leica S series medium format camera and S series prime lens. The most apparent upgrades of this latest revision are 80Plus Platinum efficiency levels and a fully modular design, plus an improved (10 year) manufacturer’s warranty. The HX series supplies are all equipped with a single +12V Rail Selection switch which gives the user a choice of running the supply in single or multiple +12V rails. The fan was relatively quiet thorough the entirety of our room temperature testing, reaching high noise figures only when very heavily loaded.