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Corsair AX860i Digital Power Supply Review

Corsair AX860i Digital Power Supply Review

Corsair AX860i Power Supply Review

Corsair AX860i – Internal

Corsair AX860i fan
By opening the PSU we can see the model information for the fan, a model which is familiar from many other units. This thermally regulated fan is manufactured by Yate Loon and is a 7blade, DC model with 12v/0.30A operation. The model number is D12BH-12 and the official specifications tell us that it has a rating of 2300RPM.

Corsair AX860i full PCB

Inside the AX860i we have a reasonably spacious design which is based on a Flextronics design. Where appropriate components are given extra stability by grey/white adhesive, wiring kept at minimal length and tied where appropriate for a tidy look and high quality components are used throughout including Japanese capacitors which we will look at shortly. A quick look at the underside also reveals some very good soldering and a check on the various screws inside confirms that they are all tightened well at the factory.

The AX-i range also has several features which combine to protect the PC components in the event of a fault developing. First up is Over Voltage Protection which ensures that the 12, 5 and 3.3v outputs do not exceed a set level. Over-Current Protection works on the same outputs to ensure DC voltage remains within safe limits. Short-Circuit Protection is also present which powers off the PSU should any of the 3.3v, 5v or 12v rails short any other rail or ground and finally we have over temperature protection.

Corsair AX860i PCB closeup Corsair AX860i PCB closeup

Corsair AX860i PCB closeup

In terms of key features we have a unit which has one +12v rail rated for 71.6A and Corsair certify their ratings at 50°C. Mixed with this high specification is an 80 Plus Platinum certified unit which means it has passed certification of 90-89% efficiency at 20% and 100% load with 50% load rated at over 92% (120V). We noted earlier that this PSU uses high quality components such as Japanese capacitors and these include a 420v/680µF capacitor rated for 105°C, the same thermal rating as the other capacitors visible elsewhere in the product. A 4 layer PCB is also present as is side synchronous rectification with low loss MOSFETs.

Also worthy of note is that this range of PSUs is the first to use digital signal processor technology to control the output of the product. This enhances voltage regulation (Corsair quoting <+/- 1.5% on 12v) as the unit can automatically compensate for voltage drop ensuring better ripple/noise performance. Digital power factor technology is also included which ensures high performance in this area, including minimal harmonic distortion and improved power train optimisation.

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Stuart Davidson

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