NZXT C1200 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% 8.096A 1.973A 1.964A 0.993A 120.001 84.263% 0 <6.0 44.47C 0.949
12.155V 5.07V 3.36V 5.036V 142.416 40.23C 115.1V
20% 17.190A 2.959A 2.95A 1.193A 239.962 89.275% 0 <6.0 45.50C 0.973
12.162V 5.07V 3.356V 5.029V 268.791 40.93C 115.05V
30% 26.614A 3.454A 3.445A 1.395A 359.266 90.853% 0 <6.0 46.41C 0.98
12.145V 5.068V 3.352V 5.02V 395.439 41.40C 115.02V
40% 36.122A 3.948A 3.942A 1.597A 479.639 90.949% 410 <6.0 41.71C 0.986
12.137V 5.067V 3.349V 5.012V 527.369 47.25C 114.99V
50% 45.255A 4.94A 4.932A 1.8A 599.444 90.601% 505 8.9 42.18C 0.99
12.130V 5.062V 3.345V 5V 660.404 48.26C 114.75V
60% 54.465A 5.932A 5.926A 2A 719.947 90.018% 696 17.2 42.94C 0.992
12.121V 5.059V 3.341V 4.99V 799.773 49.45C 114.91V
70% 63.619A 6.925A 6.922A 2.209A 839.69 89.271% 918 26.3 43.16C 0.993
12.112V 5.056V 3.337V 4.98V 940.609 50.21C 114.87V
80% 72.853A 7.916A 7.919A 2.314A 959.677 88.389% 1111 32.1 43.43C 0.993
12.104V 5.053V 3.333V 4.971V 1085.752 51.47C 114.82V
90% 82.408A 8.415A 8.409A 2.419A 1079.515 87.445% 1321 38.0 44.56C 0.994
12.098V 5.05V 3.329V 4.962V 1234.51 53.59C 114.78V
100% 91.740A 8.914A 8.93A 3.032A 1199.575 86.433% 1511 41.2 45.50C 0.994
12.098V 5.048V 3.325V 4.947V 1387.868 55.64C 114.74V
110% 100.981A 9.909A 10.027A 3.037A 1320.21 85.191% 1717 44.6 46.59C 0.995
12.100V 5.046V 3.32V 4.939V 1549.701 57.47C 114.72V
CL1 0.115A 14.265A 14.245A 0A 121.299 79.529% 489 7.9 41.78C 0.954
12.170V 5.061V 3.348V 5.038V 152.522 51.12C 115.09V
CL2 0.115A 21.723A 0A 0A 111.387 77.513% 409 <6.0 41.08C 0.950
12.173V 5.064V 3.352V 5.044V 143.695 49.72C 115.09V
CL3 0.115A 0A 21.758A 0A 73.986 72.262% 408 <6.0 40.22C 0.955
12.168V 5.079V 3.336V 5.039V 102.386 48.62C 115.11V
CL4 99.171A 0A 0A 0A 1200.048 87.191% 1487 40.7 45.79C 0.994
12.100V 5.061V 3.326V 4.986V 1376.354 55.10C 114.76V

Load regulation is within 1% on all major rails but 3.3V.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 7.9 mV 5.3 mV 3.7 mV 5.3 mV Pass
20% Load 11.2 mV 5.3 mV 4.1 mV 5.4 mV Pass
30% Load 10.0 mV 8.1 mV 5.9 mV 5.4 mV Pass
40% Load 9.6 mV 10.8 mV 10.7 mV 5.6 mV Pass
50% Load 10.0 mV 7.8 mV 5.7 mV 5.6 mV Pass
60% Load 11.8 mV 7.8 mV 4.9 mV 5.7 mV Pass
70% Load 12.1 mV 10.4 mV 6.8 mV 6.3 mV Pass
80% Load 12.5 mV 7.4 mV 9.8 mV 6.1 mV Pass
90% Load 14.0 mV 8.8 mV 8.9 mV 7.4 mV Pass
100% Load 18.9 mV 8.5 mV 8.9 mV 8.0 mV Pass
110% Load 20.7 mV 19.3 mV 13.0 mV 10.3 mV Pass
Crossload 1 9.4 mV 7.3 mV 9.4 mV 6.5 mV Pass
Crossload 2 10.0 mV 6.4 mV 4.1 mV 6.4 mV Pass
Crossload 3 7.5 mV 6.8 mV 10.0 mV 6.0 mV Pass
Crossload 4 18.1 mV 7.3 mV 6.0 mV 7.2 mV Pass

Ripple suppression is good on all rails.

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13 thoughts on “NZXT C1200 ATX v3.1 PSU Review

  1. Hello,

    My old 550W Seasonic Focus only has one 8pin connector and I am afraid to use a Y adapter to power a 250W TDP card even with a lower power target (or is that safe?). So the way I see it, I need a new power supply and unlike the underpowered Seasonic that I bought when availability was poor in early 2020 (Chinese ports were closed due to covid), I am looking for an option that is futureproof.

    However I am also motivated to not let the price get out of hand. This power supply is currently on sale for 144.90€ here in Germany at Amazon.de. At first glance, it looks like a pretty good offer. Is that power supply a good option for the money? I am intruiged by the silent operation up until 600W since I hate loud fan noises.

    Thanks for your feedback.

  2. Hi Aris and many thanks for all the great reviews and articles you brought us. It really enligthen the PSU side of PC building to me !

    I’m about to buy a new PSU of around 1200W, but I do hesitate betwin this C1200 from NZXT and the Super Flower Leadex VII XG 1300W.
    In your opinion, wich one should I choose ? The Leadex VII looks a bit better, but is it as safe the NZXT one ? On your review of the Leadex VII XG, you don’t precise if it has a Fan Failure Protection. Do you know if it does or not ?

    Also, regarding the C1200, could you please explain in wich way it is bad that 12V transient response has a deviation above 1% ? Could it cause damage to the components, or instabilities to the system, like crashes ?
    About transient response, I was also wondering why you only provide those results on 115V input ? Is it because it’s less of a problem with a 230V input ? or maybe just because the results are about the same with both voltages ?

    1. Hi! I will get the SF unit between these two. Above 1% transient response at 12V means less stability at sudden high loads. The symptoms have to do with the tolerances of the system’s parts.

      Transient response is similar at 115V/230V because it is handled by the PSU’s secondary side.

      1. Ok, great, thank you your clear advices and explanations !
        I will maybe ask you another question about the SF one on its review page (so that others could also find the answer)…

  3. How important is TVS diode on the 5VSB circuit? Most Psu Doesnt have it, only VITA GM line and Nzxt c1200 (which im aware of). Or does the MOV already took care most of the input transients?

  4. II’ve read several posts online about faulty PSUs that either broke after a few months or had very loud coil whine. These were the ATX 3.0 versions. Were these issues fixed in the ATX 3.1 version?

  5. Thought I would share my findings.
    Firstly thank you crmaris for the good review based on this I decided to get the NZXT C1200, retiring my Corsair AX1200 (it’s now more than 10 years old). I found that I am using less power now, around 0.5Amps or 115 Watt (@ 230V) less power now, I tested playing the same game for the same period and logging with my Fluke 367FC. I did find that the inrush current is a bit higher at 5.2A, vs the 4.7A my corsair had. But overall super happy.

  6. The difference between the original C1200 and ATX 3.1 version is not just limited to the 12V-2×6 connector. The new version also has one extra PCIe connector, which is good if you have a GPU with three PCIe connectors like the 7900 XTX from AIBs.

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