Corsair HX850i 850w Power Supply Review

Corsair HX850i 850w Power Supply Review

Corsair HX850i 850w Power Supply Review. We’re going to check out the Corsair HX850i 850 Watt power supply. Inside the box we have a manual, warranty information, power cable, cable ties, a bag of modular cables, and finally the unit itself.

First let’s take a physical look at the unit. On the back there’s the AC power connector, power on/off switch, holes for airflow, and some subtle branding. Over on the other side on the front you’ll find the USB port for Corsair Link, more on this later, a fan test button, and the modular outputs for you to connect the included cables. These connectors are designed so that you can only put the right cable in the right spot.

Additionally this means we only need to plug in the specific cables that we need for our build which will help keep cable management to a minimum. The modular cables provided include 1 ATX connector, 2 EPS connectors, 12 four pin peripheral connectors, 6 PCIe connectors, 12 SATA connectors and 2 floppy connectors. The cables are a bit stiff and don’t like to bend much which made the cable management process a bit slower.

Corsair HX850i 850w
Corsair HX850i 850w

On the sides there’s nothing other than some Corsair branding, which will look right way up in most cases regardless of if you mount the power supply fan up or down. While on the top or bottom depending which way you mount the unit is the 140mm cooling fan. The fan will not actually need to spin with a load of 340 Watts or less, so in order to check that the fan is operating correctly without generating the necessary load we can press the fan test button which will start spinning the fan, confirming that it’s all good.

At anything lower than 340 Watts the unit will be operating silently. The fan will start getting progressively faster and louder after around the 500 Watt mark. On the side opposite the fan is nothing other than an informational sticker. The power supply is 150mm x 86mm x 180mm and weighs 3.37kg As you may have guessed, the 850 in the name refers to 850 Watts which is how much power the unit is able to supply.

The power supply has been given an 80+ platinum rating, meaning that at 20% load the unit should be at least 90% efficient, at 50% load it should be at least 94% efficient, while at 100% it should be at least 91% efficient. With such high levels of efficiency less heat is created, which is why it’s able to run below 340 Watts without spinning the fan. When the fan does start up it’s rated to only run at 12 decibels, so it’s still fairly quiet.

There are also various protections built into the unit including over-voltage protection, over-current protection, over-temperature protection, and short-circuit protection Now let’s take a look at Corsair Link. The Corsair Link software can be used to monitor various Corsair parts in your system such as fans, lights, Corsair power supplies and Corsair CPU coolers.

In order to use it with this power supply, we need to plug the included USB cable into an internal USB header on the motherboard. While this sounds cool in theory it’s probably only going to be most useful if you stick within the Corsair ecosystem and make use of various parts from them if you want to be able to check everything within the same set of software.

In the particular build that I’ll be doing with this power supply I’m not using any other Corsair parts, so it’s unlikely that I’ll make use of Corsair Link just to monitor the power supply. Sure it’ll be interested to look at once or twice, but I can’t see myself regularly wanting to check the status of my power supply. Don’t get me wrong, there’s definitely useful information I’ve never been able to see from my power supply before, including the temperature, power usage and efficiency which is cool, but just not something I often see myself using.

While there are some one star reviews on Amazon stating that the power supply stopped working these definitely seem to be a small minority, there’s always a failure threshold with every product, nothings perfect.. There is a 10 year warranty on the power supply if you do have any issues, and my previous Corsair power supply has lasted me for over 6 years so personally I’m pretty confident in them producing a quality unit that will last.

So what did you guys think of the HX850i power supply from Corsair? Personally I’m happy to pay a little more to get a more efficient power supply as not only will it save power long term, it will also produce less heat and thereby less audible noise as a side effect. While I don’t have the tools required to thoroughly test and review this power supply extensively I hope that the information in this overview has been useful.

If it was be sure to let me know down in the comments, or leave a share on the post. Thanks for reading and don’t forget to bookmark for future tech reviews like this one.

Louise Martin

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