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.


The first thing we are going to look at with the Corsair HX1000 is its packaging, accessories, and documentation. While normally none of these items is a make or break item for a power supply the packaging quite often contains a lot of information about the product we are purchasing. The inclusion of an owner’s manual that provides actual information about our product is also of great help in many situations. Accessories are almost unnecessary with a power supply as the unit is self contained, unless it is modular, but there cases where a manufacturer can include useful accessories to make installation, routing and use more efficient.

The packaging of the Corsair HX1000 looks like that of the most recent Corsair unit we have reviewed (the SF600) only swollen up like Barry Bonds face when he "wasn't knowingly taking steroids." Prominently featured on the front of the packaging is an picture of the HX1000 along with a slew of marketing points along the bottom of the box all trimmed in a very bright yellow. We also see a pair of badges that include an 80 Plus Platinum seal. When we check the 80 Plus website, we see that this unit has been certified by 80 Plus for their Platinum efficiency level. The second badge we see lists a 10 year warranty for this unit which is certainly on the very long end of the scale (though some companies are offering longer if that is something that greatly concerns you). When we move to the rear of the packaging, we find a lot more advertising about efficiency and fan noise including graphs for both of these. Of real interest to users here is the same note that we saw with the HX1000i some time ago. The values depicted on this graph only refer to when this unit is run at the unrealistic operating temperature of 25C. So, users should be aware of that when they notice that this unit is advertised as having a zero RPM fan operation until 400W and that the peak noise output is supposed to be less than 24dBa (which is unlikely to be the case if you are actually going to push this unit like enthusiasts do). We also see here on the rear that there is a power table which we have reproduced below. As we move around to the sides of the packaging we also locate the connector count and that too is reproduced below.

The power information for the HX1000 is, in a lot of ways, similar to what we saw with the HX1000i when we reviewed that unit some time ago. For starters, Corsair claims that this unit is a single 12v rail unit in all of the printed power tables, but that you are able to select multi-12v rail mode on the unit by flipping a switch. Now, unlike with the HX1000i where this was as clear as mud on what the 12v rail arrangement actually was when yuo did this, the HX1000 manual lists the 12v arrangement when the switch is placed in multi-rail mode as this "while in the MULTIPLE position, each individual connector has Over-Current Protection so no more than 40A of current can be delivered on any given cable." So, each housing side connector is limited to 40A. That all said, our unit came with the switch in single position so that is how it was tested. Now, when we look at the actual capacity, what we have here today is a unit that has a 12v capacity of 83.3A or 1000W (actually 999.6W). When we look at the minor rails, we see that this unit has up to 25A available on the 3.3v and 5v rails each with a cumulative cap of 150W. This minor rail capacity is rather robust for modern power supplies and it is more robust than what we get from just about all of this units competitors which have been cutting that minor rail capacity over the last few years. Paired with this output, we find 8 modified 8-pin PCIe connectors, 8 Molex connectors, and 16 SATA connectors. This represents a bit of a change relative to the HX1000i as we get fewer Molex connectors and more SATA connectors. In keeping with the HX1000i similarities though, the PCIe connector count might be a bit much (particularly in light of the fact that we don't know the 12v arrangement) but GPU power usage is often overestimated by users so we are going to only stick with saying "might." Overall then, this connector assortment should be enough for the vast majority of users. In fact, if it is not you probably need to be looking at a power supply larger than 1000W anyway.

Once we open the packaging of the HX1000, we see the usual assortment of items including the power supply in a pouch, power cable, modular cables in a pouch, mounting screws, case badges, zip-ties, warranty guide, user manual, and flash drive. The user manual is shared with the HX750, HX850, HX1000, and HX1200 and tips the scales at a ridiculous 160 pages in 10 languages. The manual includes a few notes on safety protections available on the unit, package contents, some installation instructions, the cable count for each member of the series, power table for each member of the series, the same noise/efficiency graphs that were found on the packaging, and some warranty information. This, therefore, covers the majority of the information we would expect from a manual these days. However, in days gone by you used to get real electrical specifications for units from a number of vendors (not Corsair) and that was certainly nice back then. Anyway, let's move on to the build quality now and see what we are looking at there.