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Corsair AX860i 860W 80 PLUS Platinum Digital Power Supply Review (Page 5)

Zac O'Vadka | Nov 6, 2012 at 8:01 am CST - 2 mins, 55 secs time to read this page
Rating: 95%Manufacturer: Corsair

Test Results

Our load tests utilize a couple of FAST ATE active load testers and a variety of other equipment such as an oscilloscope, power conditioner, temperature probe and a power consumption meter. You can read more about our standard testing approach here.

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. Since our test equipment's limits are higher than that of the Corsair AX860i power supply, we can test it to the maximum.


The above tests represent typical loads that we have measured from various systems and are meant to give a rough idea of where your computer might fall in line with our tests. Please keep in mind that each system is different and actual loads can vary greatly even with similar hardware.

Corsair AX860i 860W 80 PLUS Platinum Digital Power Supply Review 27 |

Let's start by taking a look at the voltages to see how well this unit did during testing. Starting with the 12V rail, we see 1% regulation from start to finish with a total drop of .09V. The 5V rail managed to stay within 2% of specification as well with a total drop of .07V from start to finish. Moving towards the 3.3V rail, we see that regulation was back within 1% of specification with a total voltage drop of .05V.

DC Output quality for the Corsair AX860i was amazing and well within specification. During Test 1, we saw 6mV of noise on our scope. When we increased the loads in Test 3, the ripple climbed to 12mV at a little over half load. During Test 5 under a load of 860WW, the oscilloscope showed a maximum of 18mv on noise on the 12Vrail.

The Corsair AX860i is rated for 80 PLUS Platinum efficiency. This means that the power supply must perform at 90%/92%/89% efficiency at 20%/50%/100% loads respectively. As you can see, the AX860i passed on our bench and wasn't close to failing at any point.

Final Thoughts

Whenever we see top end enthusiast features trickle down to the mid-range market, a combination of three possible things happen. Either you pay out the nose for it, get it with reduced quality, or get it with reduced features.

Corsair didn't cut any of the features from the AX1200i when designing the AX860i. You get the same functionality across the board. This includes the DSP, high efficiency, real-time monitoring with integration into Corsair Link, and even the ability to set custom OCP points as you wish. They didn't cut from the quality of the unit either. Voltage regulation, DC output quality, and efficiency are all almost identical to what was delivered with the AX1200i. You simply can't ask for more out of a power supply.

Unfortunately this leaves just one way for this to go. The Corsair AX860i is definitely in the category of paying a premium for what you get. At a price of $249.99, it is certainly going to hit the wallet for a power supply that is less than 1000W. Once you've got your hands on it, you'll know where that money went, and if you're any sort of enthusiast, it will be very apparent that your money was very well spent.

It is cost and cost alone that keeps us from giving the AX860i an Editor's Choice award over the Performance award. If it were just a bit more competitively priced, it would be an unbeatable package.

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Last updated: May 11, 2020 at 03:41 pm CDT

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Zac O'Vadka


Zac provides professional IT support by day, but plays the role of enthusiast by night. He's been building high-end custom computer for the nearly fifteen years and writing PC hardware reviews for the better part of a decade. Aside from computers, he also dabbles in quite a bit of home A/V equipment. Throughout the years, Zac has picked up an extensive knowledge of power circuitry and leverages this to provide the PSU reviews. When not found testing or writing, you can often find him speeding through the winding countryside on his motorcycle.

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