Corsair HX1000 1000W Power Supply Review

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 Corsair HX1000 is the latest in a long string of power supplies that we have seen from Corsair. However, over the last few years the seas have been tough and not all of the units we have seen from Corsair have fared as well in our testing as their earlier offerings. Today though, is a new day. The sun is shining. The breeze is in our beards and the horizon stretches before the eye. The question becomes, then, for us, does the HX1000 look like that old HX1000W or has it kept up with the times better than many of those interim ~1000W units we have seen from Corsair? Let's see.

HardOCP’s testing methodology is intended to very much push power supplies to their advertised wattage rating in temperatures that will represent some of the hottest computer enthusiast cases. So if a unit passes all our testing it is definitely not something to take lightly. In fact we expect more power supplies to fail our testing than make it through unscathed.

Build Quality

The build quality of the Corsair HX1000 is starting the day off in very nice shape. Stylistically, this unit is very much like the recent AX and HX units. The quality of the exterior build is still top notch and includes cabling which features an all modular arrangement of FlexForce style cables and standard sleeving. That said, the cabling may be the biggest downside to the exterior as some people prefer the FlexForce style on all of their cables and others will bemoan the fact that some of the cables have capacitors. Once we move to the interior of the HX1000, we see that design is similar to what we saw with the HX1000i. The topology is still very modern and the layout is very open with nice integration and very good soldering. The component selection is generally very good to excellent with the standard electrolytics being provided by Nichicon and Nippon Chemi-con while the solid capacitors come from Nippon Chemi-con and FPCAP. Backing up all of this is a 10 year warranty, which is longer than what we saw on the HX1000i when we reviewed that unit. Lastly, the documentation that comes with the unit is "OK," but it does leave a lot to be desired.

Load Testing

Starting things off in our by the numbers portion of today’s we review, we see that the load testing results for the Corsair HX1000 are all very good/excellent. In our testing, the 12v rail showed a peak change of 0.08v while the 5v and 3.3v rails showed peak changes of 0.03v. While these values were well within specification, that does not, necessarily, mean that they are great relative numbers by default. So, we have to turn our attention to some "comparable units." When we do that we see that this unit is solidly middle of the pack relative to non-Corsair ~1000W units that are "comparable" as this unit trailed the Seasonic PLATINUM-1050, Seasonic Platinum-1000, and Seasonic PRIME 1000W Gold while besting the FSP AURUM PT 1000W and Antec HCP-1000 Platinum. So, starting the day, we see that this unit is competitive and doing better than its ~1000W predecessors at Corsair. When we move along to the efficiency level of this unit, we see that the unit’s efficiency does well as the unit ranged from 89.12% to 93.80% efficient at 120v and 87.49% to 93.15% efficient at 100v. When we look at the 80 Plus results we see that using 80 Plus’ loads, and conditions, the HX1000 was 93.61%-93.10%-88.59% efficient. While excellent, these values mean that this unit falls just short of the 80 Plus Platinum category.

Moving on to the Transient Load Tests, we see that this unit posts values that are excellent in a lot of ways but not exactly class leading. During our Transient Load tests, the 12v rail had a peak change of ~360mV and the loaded 5v rail had a peak change of ~60mV while the unloaded 5v rail during the 12v load had a peak change of ~40mV. When we look at the 5v values we can clearly see where the excellent in a lot of ways comes in today. However, the 12v value is not quite as good and, largely, because of this the HX1000 ends up mixed with the Antec HCP-1000 Platinum, FSP AURUM PT 1000W, Corsair HX1000W, and Seasonic PRIME 1000W Gold. However, it does best the the Seasonic Platinum-1000, Seasonic PLATINUM-1050, SilverStone ST1000-PT, Corsair HX1050, and Corsair HX1000i. So, it is not like this is the worst unit we have seen but it is just not the best we have seen either. It is, in fact, competitive.

DC Output Quality

Moving along to the DC Output Quality of the Corsair HX1000, we see this unit turn in a performance that is, perhaps, a bit surprising in how good it is given previous Corsair units and the just good nature of the results we have seen so far. Indeed, the HX1000 passes this portion of testing by a huge margin as the peak values it posted were ~20mV on the 12v rail, ~15mV on the 5v rail, and ~10mV on the 3.3v rail. These values seem to be excellent, but their excellence is not completely appreciated until we see that this unit was better than all of the units we compared it to today except for the FSP AURUM PT 1000W and Seasonic PLATINUM-1000 which it was mixed with. That makes for a very impressive relative result and it gives us the first truly outstanding result from this unit today.


When we look at the capacity of the Corsair HX1000, we see another power supply that falls into that realm where serious quiet cooling enthusiasts just won’t take it seriously. However, other users probably will as a 1000W power supply still draws a lot of attention from people who say they want a quiet unit. For those people, Corsair has done a lot to deliver with the HX1000 as it has most all of the features you would expect from a modern unit that is quiet including a large FDB fan and a fan controller that allows for fanless operation under certain load conditions. During our testing, those features did seem to pay off for the most part as the unit was undetectable in our load tests through 75% load. After that, it was most detectable during the 8 hour Torture Test and a lot of that feels like it is due to the fact that the unit was running for 8 hours. Even then though, while detectable, the unit was not loud and just about any reasonable user would find the unit to be acceptable.

Paul's Thoughts:

The Corsair HX1000 is the latest power supply from Corsair that we have seen in the HX/Hxi line and, unlike previous recent examples, it seems to have shaken a good bit of the malaise that had been surrounding Corsair offerings. Indeed, for a while Corsair seemed to be stuck in their own Malaise Era that would have made Detroit proud. However, in the last two years we have now seen two very good products from Corsair in the guise of the SF600 and today's HX1000. Certainly, two units do not make for a huge sample size, but it definitely gives us hope that we are seeing a rebound from one of the brands that originally knocked our socks off time and again when we started reviewing power supplies here at HardOCP, 11 years ago. Hopefully these are simply stepping stones to much greater things from some of Corsair's upcoming products. However, no matter what the HX1000 and the SF600 look to be safe bets in Corsair's lineup today and ones we would love to own ourselves.

The Bottom Line

The Corsair HX1000 is the latest power supply we have seen from Corsair and, today, it represents a very solid option and a very solid improvement over the HX1000i we last saw in this output range. Starting with the very good build quality today things looked good and this was followed up by excellent voltage regulation, excellent DC output quality, very good/excellent Transient Load Tests results, excellent efficiency, and a very low noise profile. Indeed, by absolute numbers the HX1000 is showing us a lot of what we used to see from Corsair as we used the word excellent a number of times and that is certainly a good thing. However, the entire market has gotten better and, so today, while being a very good absolute unit the HX1000 ends up just in the mix with the units we compared it to today. One thing that could certainly pull this unit ahead of those other options is the unit's pricing. Today, we see that the HX1000 is coming in at $249.99 plus shipping which is definitely on the high side of things considering where the units we compared this unit to launched at, and/or continue to retail for. On top of that, it is the same price as the HX1000i (though it is the better deal between those two units as we see today) without all of it's digital "goodies." What this all means then is, the Corsair HX1000 is the best 1000W unit we have seen from Corsair to date. The market and pricing, however, make this unit a bit tougher to recommend carte blanche than that would make it seem, though it is a unit that will not let you down if you do pick it up. Bring the price down a bit, though, and Corsair will have a real winner here today and that potential is great to see once more in their lineup. The Corsair HX1000 is easily the best 1000 watt plus PSU we have seen it produce in the last seven years. Kudos!

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Corsair HX1000 1000W Power Supply


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