External Appearance

Without a doubt, the AX1500i has an imposing presence. It is based on the same subtle visual theme as the rest of the AX series, but the 22.5 cm (8.86 in) long chassis is definitely eye-catching. It goes without saying that the AX1500i will not easily fit inside small cases and compact designs, but that's hardly a problem as this clearly is not a product meant to power anything less than the most advanced gaming computers and workstations. Decorative stickers can be seen on both sides of the chassis, while the sticker with the electrical specifications can be found at the top. The fan guard is a combination of circular and parallel wires, visually complimented by the embossed parallel lines design of the chassis.

The front of the chassis is littered with the many modular cable connectors, as well as the Corsair Link USB connector and a self-test button. The back is plain, with just the C19 cable plug and a small switch to be found. The switch does appear very small for a unit of this size but actually the AC input does not go through the switch, as with most designs; the switch electronically isolates the AC input by deactivating the inrush current relay. This is a neat trick and actually improves efficiency a little bit as well, as there are no losses on the contacts of the switch.

Internal Design

The 140 mm fan responsible for the cooling of this monster is a Corsair-branded NR140P fluid dynamic bearing fan. There is little information about this particular fan to be found in Corsair's website but, after testing the fan, our instrumentation shows that it has a maximum speed of about 2100 RPM and a maximum volume flow of about 75 CFM.

Unsurprisingly, Flextronics is the OEM behind the creation of the AX1500i and it is somewhat similar to the smaller AX1200i. However, there are great differences as well; in order to improve the efficiency to meet 80 Plus Titanium standards, Corsair essentially made the entire unit digital.

The build quality is exceptional, with an immaculate soldering job and a ridiculous amount of glue used to mechanically secure the components and minimize high frequency vibration noises. In fact there is so much glue that many components are literally buried inside lumps of grey stuff. Unfortunately, due to the excessive use of glue, we could not fully identify the number of AC filtering components. We were able to count six Y capacitors, four X capacitors, and three filtering inductors, which is already more than enough, but we suspect that even more of them are hidden under the lumps of glue.

Elsewhere, a metallic shield guards against EMI. It is also worth mentioning that thread locker glue has been used on almost every screw and metallic clips are used to ensure the tight contact of transistors onto the heatsinks, which is definitely not something we see every day – as a matter of fact, not even most top-tier units are so well made.

The major changes over the AX1200i, as well as over any other PSU that we have seen to date, are located at the primary rectifier and PFC circuit. Instead of using a rectifier bridge, Corsair is using two transistors for rectification and they have eliminated the PFC diode, replacing it with a digitally controlled circuit that allows for the generation of higher quality waveforms. As for the passive PFC components, there are four large coils and two Nippon Chemi-Con 680 μF capacitors. And when we get to the secondary capacitors, chaos ensues. There are electrolytic capacitors from at least three brands (Nippon Chemi-Con, Rubycon, and Nichicon) and solid capacitors from at least two manufacturers (CapXon and Teapo), and we may have missed some under the mountains of glue.

The second major change lies at the generation of the DC voltage lines. Unlike most other advanced units that generate only a single 12 V line and then convert all minor lines from it, the AX1500i has two virtual LLC converters. The major LLC converter generates the massive 12 V line and the secondary converter generates the 5 V line. The 3.3 V line is then derived from the 5 V line via a typical DC-to-DC converter. Due to the insane amperage, Corsair had to use large metallic bars to distribute the ground on the connector's PCB. A metallic bar also collects the freshly generated 12 V line, but it is then transferred onto the secondary PCB via seven thick wires.

Corsair Link

A couple of years ago, Corsair introduced the Link software that allowed for the monitoring and even partial control of compatible devices. It can be used to monitor and log system parameters, such as the CPU temperature and the speed of fans, as well as to perform certain actions when the appropriate hardware is used. For instance, you can program the lighting of the Hydro H100i to change according to the temperature reading.

With the AX1500i, Corsair Link can be used to monitor just about every primary parameter; voltage, amperage, and power on both the input and outputs, as well as the internal temperature and the speed of the cooling fan. The user can also create virtual OCPs, limiting the maximum current through certain connectors. As far as accuracy is concerned, the software readings usually are a bit off, but they are precise enough to be useful to the end user. You can see in the following pictures that we are using Link to depict the stability of the AX1500i when the input voltage is changed while the unit is operational; the AX1500i simply kept working without a glitch both when the voltage took a dive from 230 VAC to 127 VAC and when it went up to 248 VAC.

While the software worked well for us, we should mention that the version of Corsair Link with support for the AX1500i is still a Beta, so glitches and software issues could arise. We didn't encounter any during the limited time of our testing, however.

Introduction, Packaging & Bundle Cold Test Results
Comments Locked


View All Comments

  • Pissedoffyouth - Thursday, September 11, 2014 - link

    In the scheme of things if you were running this full bore you'd be able to power an extra i3 system as well on 220v.
  • E.Fyll - Friday, September 12, 2014 - link

    Actually, no, you should be seeing very similar results. I'm on a 230 V - 50 Hz grid, it is noted in the methodology section.
  • Flunk - Thursday, September 11, 2014 - link

    Why would a power supply need accessories? When I'm buying a power supply the unit itself is all I care about. Bundle a power cable that won't burn the house down and I'm good. The case badge, screws and bag are totally unnecessary.
  • Vatharian - Thursday, September 11, 2014 - link

    I consider spare cables with different plug configurations, if PSU is modular, a very good accessory. Screws always come in handy - if you don't need them just shove back in the box, but sometimes you have to build in the wild, where you don't have any extras. Over the years I accumulated nearly geological layer of such accessories from hundreds of devices, but sometimes it just happens you need them. Of course if you throw them out (or don't get them in the first place), there will be time you miss some :) And sticker is always handy too - I have a friend that's sticker junkie, his PC looks like it had accident at the printer shop)
  • DanNeely - Thursday, September 11, 2014 - link

    Gotta agree with the extra cables. A few 2/3 port molex/sata cables mean a lot less having to manage extra cable when you don't need all 4 ports on them. I've seen some vendors offer an alternate cable package (different plug counts, shorter cables, extra long cables, extenders, etc); but at this price I'd expect to see at least some of that tossed in.

    For that matter, why is modularity limited to the PSU-cable connection itself. Make a few cables that will let you break off the last connector or two to shorten them.
  • JlHADJOE - Thursday, September 11, 2014 - link

    It's probably cheaper to just include a bunch of cables with shorter run/fewer terminations and be able to use standard components, than to engineer a completely new terminal with a breakoff/attachment point just to be able to provide a shorter cable.
  • DanNeely - Friday, September 12, 2014 - link

    All they'd need to do is take molex Y cables, and put both downstream connectors on the same cable; and then do the same with sata power connectors. No major engineering effort needed.
  • hrrmph - Thursday, September 11, 2014 - link

    What a sloppy review. It reads like an impassioned love letter. And hardly a comparable product mentioned or charted.

    My comments shouldn't be taken as directed at the product - I have no quarrel with the power supply - just the squishy drivel being published in an attempt to describe it.
  • sweetca - Thursday, September 11, 2014 - link

    Question: Stipulating an identical draw of power, would this PSU, compared to a similar PSU with a lower max output, result in less heat generated?

    An example for clarification: System X draws 500 Watts. Would there be a difference in total heat generated, whether System X had a 1000 Watt PSU or 1500 Watt PSU? The assumption being the quality of both PSU's were almost identical
  • davidgirgis - Thursday, September 11, 2014 - link

    Good Question...

    Heat losses depend on the quality of the PSU components and its ability to sustain such power efficiency at different power draws, so I believe the short answer is No, it shouldn't matter. This reviewer says that this specific power supply provides for good efficiency even at low power draw, meaning that it generates little heat regardless of whether your load is 200 or 1500 watts.

    Of course your hypothetical 500W system will draw 500W at times, but maybe only 50W when idle...

    The advantage of having more power than you need is to let the components breathe better, widen the pipeline so to speak. You may not need 1500W, but the extra headroom provides for stabilty and overclocking potential.

    hope this helps...

Log in

Don't have an account? Sign up now