Corsair RM1000x ATX v3.1 PSU Review

Load Regulation

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
10% 6.524A 1.968A 1.994A 1.011A 99.993 86.265% 0 <6.0 44.30C 0.977
12.016V 5.08V 3.31V 4.948V 115.916 40.09C 114.88V
20% 14.076A 2.953A 2.993A 1.214A 199.942 90.006% 0 <6.0 45.52C 0.991
12.009V 5.079V 3.308V 4.941V 222.14 40.98C 114.85V
30% 22.028A 3.446A 3.493A 1.419A 299.996 91.444% 0 <6.0 46.28C 0.985
11.982V 5.079V 3.307V 4.934V 328.064 41.24C 114.81V
40% 29.927A 3.938A 3.993A 1.624A 399.545 91.504% 0 <6.0 47.48C 0.986
11.974V 5.079V 3.306V 4.927V 436.642 41.96C 114.78V
50% 37.503A 4.923A 4.994A 1.83A 499.277 91.237% 0 <6.0 48.19C 0.989
11.966V 5.079V 3.304V 4.919V 547.23 42.07C 114.74V
60% 45.163A 5.909A 5.998A 2A 599.677 90.776% 440 6.4 42.53C 0.991
11.957V 5.078V 3.302V 4.916V 660.62 49.18C 114.7V
70% 52.760A 6.896A 7.002A 2.24A 699.541 90.204% 581 13.0 43.11C 0.992
11.949V 5.076V 3.3V 4.911V 775.513 50.14C 114.67V
80% 60.441A 7.88A 8.006A 2.344A 799.571 89.492% 773 23.2 43.72C 0.993
11.940V 5.076V 3.298V 4.907V 893.445 51.79C 114.62V
90% 68.456A 8.374A 8.494A 2.448A 899.373 88.775% 954 29.8 44.80C 0.993
11.933V 5.075V 3.296V 4.902V 1013.087 53.82C 114.59V
100% 76.278A 8.868A 9.014A 3.063A 999.365 88.011% 1211 36.5 46.00C 0.994
11.926V 5.074V 3.295V 4.898V 1135.505 56.03C 114.54V
110% 84.045A 9.856A 10.113A 3.066A 1099.967 87.126% 1490 41.9 46.56C 0.994
11.918V 5.072V 3.293V 4.892V 1262.507 57.49C 114.5V
CL1 0.117A 17.794A 18.117A 0A 151.303 82.173% 496 8.6 42.57C 0.987
12.010V 5.074V 3.29V 4.938V 184.128 48.05C 114.85V
CL2 0.115A 19.658A 0A 0A 101.347 82.083% 442 6.4 40.96C 0.981
12.018V 5.085V 3.307V 4.945V 123.468 48.03C 114.87V
CL3 0.115A 0A 20.017A 0A 67.398 74.96% 442 6.4 40.62C 0.975
12.017V 5.088V 3.298V 4.946V 89.911 49.78C 114.88V
CL4 83.820A 0A 0A 0A 999.934 88.617% 1139 35.3 45.79C 0.994
11.929V 5.083V 3.309V 4.903V 1128.378 56.74C 114.55V

Load regulation is tight on all rails.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 11.3 mV 10.6 mV 10.5 mV 10.1 mV Pass
20% Load 12.0 mV 11.3 mV 11.0 mV 9.9 mV Pass
30% Load 14.8 mV 10.8 mV 11.4 mV 10.7 mV Pass
40% Load 15.5 mV 11.5 mV 12.3 mV 11.1 mV Pass
50% Load 15.4 mV 12.5 mV 12.6 mV 11.6 mV Pass
60% Load 14.9 mV 11.2 mV 12.4 mV 11.1 mV Pass
70% Load 15.7 mV 12.2 mV 12.9 mV 11.8 mV Pass
80% Load 15.9 mV 12.0 mV 13.8 mV 10.6 mV Pass
90% Load 17.0 mV 13.1 mV 14.1 mV 12.4 mV Pass
100% Load 23.9 mV 16.9 mV 17.8 mV 14.9 mV Pass
110% Load 24.6 mV 15.8 mV 18.0 mV 15.3 mV Pass
Crossload 1 15.4 mV 13.0 mV 18.1 mV 11.7 mV Pass
Crossload 2 11.7 mV 15.4 mV 12.3 mV 11.7 mV Pass
Crossload 3 11.8 mV 10.6 mV 15.9 mV 11.4 mV Pass
Crossload 4 24.4 mV 14.6 mV 14.7 mV 12.0 mV Pass

Ripple suppression is good overall.

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17 thoughts on “Corsair RM1000x ATX v3.1 PSU Review

  1. Hello ,is load regulation and load balancing the same thing on the PSUs ? Seasonic states on their website that their say Vertex GX-1000 models got micro tolerance load regulation ,so how is this important and is it just more of a marketing thing? Thanks.

      1. Another question : do we need a new PSU with ATX 3.1 for RTX 5080/5090 for better load balancing thus preventing uneven load on the cables and not melting them or older PSUs do just fine ,for instance like ATX 2.4 PSU ? In short does ATX 3.1 PSU does a better job at load balancing? Thanks

          1. So is that correct that it does not matter if say I use 3×8 pin on the psu side versus the native 12V-2×6 cable ? What I mean is: is 12V-2×6 connector any safer than 3×8 pin connectors for load balancing and cable overheating in your opinion?

  2. in the “relative performance” image at page “overall performance”, it says lower is better. Shouldn’t it be “higher is better”?

  3. Hi, I bought this PSU for my new build and since the installation his fan makes a really annoying noise, as if it runs at 100% even in the desktop. Could you help me pls

  4. Hello,

    I am considering buying this PSU model, in order to upgrade my AM4 system (for reference – R7 5700X3D / RTX 4070 Super / 32 GB DDR4), so I checked for compatibility issues on pcpartpicker and got the following warning: “The Corsair RM1000x (2024) 1000 W Fully Modular ATX Power Supply does not provide a -12 V supply voltage. We are unable to verify if the MSI MEG X570 UNIFY ATX AM4 Motherboard requires it.”. Do you know if this Corsair PSU is compatible with my motherboard? I would be very grateful if you could advise. Thanks!

  5. Hello,

    In your article, Stand_By_230V is equal to 0.08W.
    The new Corsair RM1000x ATX v3.1 arrived to me today.
    In my case, Stand By at 237V is 21,7W. In this case, the current is 0,143 A.
    Another nuisance, if you turn off the power supply on the power supply, the consumption drops to 20.5W (current 0.142A), but there is no complete shutdown.
    The computer does not turn on, meaning it is de-energized, but the PSU is not. This is the first time I have encountered such a strange phenomenon.
    Return the power supply as faulty?

    1. Standby I measure is with the PSU NOT connected to anything. It is entirely different from what you did. Also, measuring such low wattage is tricky. You need good equipment.

      1. Thank you for your answer!
        I measure the actual power and current consumption of the Brennenstuhl EM 240. Although it is ancient, it measures quite accurately, in my opinion, the new Samsung TV in Stand By consumes less than 1 watt, it matches.
        And what about the switch, should it completely de-energize the power supply?

  6. I’m looking into getting one of these.
    But they have also downgraded the fan which is dissappointing, the previous version of the RM1000x had a magnetic levitation fan (NR140ML). Given that both versions are currently available (with the older coming in cheaper) – I am wondering if the prior version is a better purchase

  7. I bought one of these. It made a small amount of coil whine when I tested it in my old PC, but only when idling in windows (starting any app up made the noise go away completely). However on my main PC it makes no noise whatsoever, phew! I like the fan control, I have it turned to it’s lowest setting where it is still inaudible but at least this removes the heat rather than letting it radiate in to my PC case.

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