Seasonic Prime TX-1300 ATX v3.0 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% 9.039A 1.978A 1.988A 0.98A 129.993 91.642% 0 <6.0 44.46C 0.967
11.992V 5.056V 3.32V 5.104V 141.84 40.23C 114.81V
20% 19.106A 2.968A 2.984A 1.175A 259.942 93.988% 0 <6.0 45.31C 0.978
11.988V 5.054V 3.318V 5.106V 276.555 40.63C 114.78V
30% 29.497A 3.463A 3.483A 1.369A 389.522 94.549% 0 <6.0 46.22C 0.983
11.983V 5.053V 3.316V 5.113V 411.982 41.13C 114.73V
40% 39.930A 3.959A 3.983A 1.568A 519.521 94.387% 0 <6.0 47.46C 0.983
11.979V 5.052V 3.314V 5.102V 550.423 41.93C 114.69V
50% 50.040A 4.951A 4.982A 1.763A 649.694 94.055% 497 9.7 42.33C 0.987
11.974V 5.049V 3.312V 5.105V 690.754 48.34C 114.65V
60% 60.158A 5.944A 5.983A 1.961A 779.849 93.554% 499 9.8 42.65C 0.989
11.969V 5.048V 3.31V 5.101V 833.577 49.19C 114.6V
70% 70.258A 6.937A 6.982A 2.156A 909.768 93.013% 497 9.7 43.39C 0.992
11.966V 5.046V 3.308V 5.103V 978.122 50.43C 114.56V
80% 80.388A 7.928A 7.984A 2.256A 1039.438 92.363% 544 12.4 43.70C 0.993
11.961V 5.045V 3.306V 5.096V 1125.377 51.74C 114.52V
90% 90.937A 8.425A 8.473A 2.357A 1169.724 91.74% 590 15.1 44.52C 0.993
11.956V 5.044V 3.304V 5.09V 1275.044 53.56C 114.46V
100% 101.226A 8.922A 8.993A 2.941A 1299.362 91.07% 637 17.7 45.47C 0.994
11.950V 5.043V 3.302V 5.101V 1426.761 55.56C 114.42V
110% 111.456A 9.916A 10.09A 2.947A 1429.606 90.332% 899 29.0 46.72C 0.994
11.945V 5.042V 3.3V 5.09V 1582.614 57.58C 114.36V
CL1 0.117A 14.924A 15.02A 0A 126.301 87.611% 499 9.8 41.90C 0.968
11.991V 5.046V 3.302V 5.057V 144.168 47.38C 114.81V
CL2 0.115A 24.726A 0A 0A 126.232 86.311% 499 9.8 40.52C 0.968
11.991V 5.049V 3.314V 5.06V 146.25 47.56C 114.81V
CL3 0.115A 0A 24.995A 0A 83.883 81.152% 498 9.7 40.16C 0.958
11.991V 5.055V 3.301V 5.06V 103.361 49.23C 114.81V
CL4 108.807A 0A 0A 0.001A 1299.941 91.443% 637 17.7 44.88C 0.994
11.947V 5.06V 3.318V 4.994V 1421.583 55.86C 114.41V

Load regulation is tight enough on all rails. Moreover, this is among the few times I have seen a PSU with a load regulation within 1% at 5VSB!

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 13.4 mV 11.8 mV 13.9 mV 20.3 mV Pass
20% Load 12.3 mV 9.7 mV 11.8 mV 25.8 mV Pass
30% Load 12.6 mV 10.7 mV 12.9 mV 26.2 mV Pass
40% Load 14.7 mV 12.8 mV 14.9 mV 26.9 mV Pass
50% Load 15.0 mV 12.6 mV 15.7 mV 14.2 mV Pass
60% Load 15.3 mV 13.2 mV 15.5 mV 22.2 mV Pass
70% Load 12.8 mV 10.2 mV 13.9 mV 27.5 mV Pass
80% Load 13.0 mV 10.6 mV 14.0 mV 31.4 mV Pass
90% Load 13.0 mV 11.0 mV 15.4 mV 31.7 mV Pass
100% Load 19.9 mV 12.5 mV 18.0 mV 32.9 mV Pass
110% Load 20.9 mV 12.3 mV 18.1 mV 32.5 mV Pass
Crossload 1 17.0 mV 10.1 mV 16.0 mV 6.8 mV Pass
Crossload 2 12.9 mV 17.8 mV 15.9 mV 7.2 mV Pass
Crossload 3 10.5 mV 10.1 mV 16.7 mV 7.1 mV Pass
Crossload 4 21.1 mV 12.1 mV 15.6 mV 11.2 mV Pass

Ripple suppression is good on all rails.

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10 thoughts on “Seasonic Prime TX-1300 ATX v3.0 PSU Review

  1. Hello, back here where it all began!

    Following this wonderful guide, I purchased the aforementioned beast. I’ve had it for 6 months now and I can confirm the splendid features in terms of efficiency but above all it is totally silent.

    However, with the release of the ATX 3.1 standards, I ask at this point if it is compatible with the new 3.1 and if the cable will be suitable for a hypothetical 5000 series GPU.

    Thank you

    1. Hi! The cable remains the same, so it will be compatible with 5000 series, given that Nvidia won’t change the connector on its own again (which I doubt)

      1. Okay, thanks for the reply! So there are no good reasons to change it with a PSU with ATX 3.1 and PCIe 5.1 standards like the 1600 Noctua edition?

  2. Aris, have you noticed any weird noise when the PSU fan starts or stops? Or erratic fan behavior in this unit?

    My Seasonic Prime PX-750 had the fan start up and stop constantly while I was gaming. The fan itself was quiet but I could hear a weird rattling noise for one second as the fan started or stopped. This also sometimes happened at idle.

      1. 100% sure. It would happen when I switched Hybrid mode on and off. There was nothing rattling around in the PSU, nothing was stuck in it.

        1. Alright, update. No such noises coming from this PSU’s fan, just as advertised on this review, it is extremely silent. I was shocked at how silent it was. Normal behavior both in hybrid and always on mode. I keep my fan always running.

  3. I see all your expensive testing equipment push to the limits but please no 30 pages ahah.

    This PSU is gorgeous, look amazing for the people with a pc case showing it on the side/bottom. Some luxury sport car with the chrome look.
    Breaded cables very nice. It’s a personnal pref but downside they are 60-75cm ! I built a few mid-tower pc and i never needed more than 50cm for the ATX and GPU. Big hassle to hide all this extra ;(
    510€~ on Amazon for this monster, if i was not beyond the return window for my own PSU i would be tempted.

    I snatched a MSI MEG AI1300P for 279€ with the MSI Cashback/Review. Decent for platinum 1300w. I like the fact that the fan control is possible with msi center and usb mobo. Plus it’s start running auto by default only when it’s 65°C i believe.

    1. I highly recommend setting the PSU to the minimum fan RPM of 700. You don’t need the MSI software to keep running after you set it.

      I have this PSU and in my opinion, the fan starts way too late. I don’t like the amount of heat the PSU puts out, so I left mine running like specified above, and the PSU never heats up past 48C even during intense gaming (4090 and 14900K).

      I will replace it with this Seasonic Prime TX-1300 unit in a bit, though. Only reason I got this MSI was because Seasonic had no ATX 3.0 units at the time. I always feel more comfortable with Seasonic in my rig – not to say the MSI is bad, far from it. It’s a very high quality unit. I’m just a Seasonic kinda gal.

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