Corsair HX1000 1000W Power Supply Review

Author:Paul Johnson

Editor:Kyle Bennett

Date: Tuesday , January 23, 2018

The Corsair HX1000 computer power supply is, you guessed it, rated for 1000 huge watts of power delivery to your enthusiast system build. All of this comes in rated at extremely high efficiency, while being fully modular, all Japanese capacitors, and boasting "extremely tight voltage regulation." Let's put all that to the test.

External Build Quality

As we already know the Corsair HX1000 features a single 135mm fan. 135mm fans are in the same vein as 120mm fans in that they can provide for quiet cooling environments due to the ability to move a larger volume of air at slower speeds than a smaller diameter fan. The 135mm fan is about the largest diameter fan we are likely to see in ATX power supplies given the physical constraints of the form factor. While great for quiet computing environments the key criteria in our evaluation is whether or not the cooling solution is sufficient, not necessary it’s sound level or form factor.

The exterior of the Corsair HX1000 looks like that of a number of other units we have seen since Corsair updated their power supply lines a few years ago. The external build quality is again very nice with the unit finished in a rugged, black, finish coupled with a rather flat accent color, but it still pops a bit while being understated. While other brands use understated color schemes and that works well for them, this color scheme today just seems fairly bland, but that may be just what you are looking for. However, on the interesting side of the ledger, the fan grille that we have commented on in the past is back once more. The modular interface on this unit is very much like what we have seen with other Corsair units, so not much is new there other than the switch that sets this unit in single 12v rail mode of multi-12v rail mode. Beyond that, the rear of the unit looks like just about all of the rest of the Corsair units we have seen with this housing type.

In the picture above we have removed the sleeving in order to inspect and show the capacitor contained within, it is NOT a defective sleeving job.

The Corsair HX1000 comes in at ~7 1/8 inches long. Additionally, the modular cables reach out to ~19 to 27 inches at the first or only connector. The cables are all sleeved completely in the FlexForce style flat cable sleeving or in standard mesh (which is short of being complete). In addition, some of the cables feature in line solid capacitors provided by FPCAP.

Internal Build Quality

Once we open the new CWT built HX1000, we see a very modern design. From the top, we see that this particular unit has a half bridge topology with LLC resonant conversion and a secondary where we have synchronous rectification coupled with DC-DC VRMs (which is a similar topology type to what we have seen in other high-end modern units). We also see that the unit has a total of four heatsinks of various shapes and designs. These heatsinks are paired with a Corsair branded FDB fan rated at 0.22A at 12v. When we look at the main PCB, we see that the soldering quality here is quite excellent which is not something we always see even with high-end products.

Starting at the input filtering, we see that it begins on the AC receptacle with a couple of Y capacitors. It then moves on to the edge of the main PCB where we see some Y capacitors, X capacitors, MOV, etc. In the middle of this filtering we see the bridge rectifiers sandwiching a heatsink. Continuing to the primary side proper, we see the large flat barlike heatsink on the exterior edge of the PCB housing the PFC power components. Interior of that heatsink, we find the main input capacitors which are a pair of Nichicon capacitors rated at 400v 470uF 105C and 400v 680uF 105C. Slightly towards the input filtering side of the PCB, we find an add-in PCB which houses the PFC controller and resonant controller. Moving then towards the middle of the unit, we find another heatsink which houses a pair of MOSFETs.

As with the previous HX1000i, we notice that the secondary is very open looking with very little in the way of heatsink real estate. There are a pair of small thin pieces of metal to act like heatsinks for the attached 12v MOSFETs but the majority of these MOSFETs are not attached to them. These MOSFETs make up just two of the add-in PCBs found on the secondary side. The second largest add-in PCB houses the fan controller while the largest add-in PCB houses the DC-DC VRMs with the PWM controller. Also, throughout the secondary, we see a number of Nippon Chemi-con standard and solid capacitors. We also see a number of solid capacitors on the modular PCB but these are provided by FPCAP. The modular PCB itself is well constructed and the soldering is generally neat but it certainly is not the best we have ever seen. Indeed, while not an issue per se, it does have that hand worked feel to it today.

Build Quality Summary

The overall build quality of the Corsair HX1000 is excellent and that is one area where Corsair has generally been consistent over the years even if the performance metrics have not been. The exterior of the HX1000 generally falls in line with what we have seen from our recent AX and HX type units from Corsair since their "redesign." However, there are a few changes today on the modular interface as we have the selector switch for rail assignment but that is not a quality or even an aesthetic issue. It just sort of "is." The fit and finish is again excellent on the exterior and we see that we have a mix of FlexForce cables and standard sleeving with inline capacitors installed. When we move to the interior, things continue to be high quality. The topology is thoroughly modern, the layout looks very good, and the soldering, while looking hand done occasionally, is generally very neat. We also see that the component selection is generally very nice with Nichicon and Nippon Chemi-con providing the standard electrolytics. The solid capacitors come to use from Nippon Chemi-con and FPCAP which are both excellent. The other major component that people like to dwell on is the fan and, today, we see a Corsair branded FDB fan which, by its bearing type, should make quiet cooling enthusiasts happy. Bearing type is, obviously, not the only thing important to noise output and we will talk about this again later during testing. Other than that though, we see only a few minor quibbles with integration choices but nothing that should worry users. With that all covered, let’s move on now and see what this unit can do!