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Asus ROG Thor 1200W PSU Review – a heavily modified Seasonic!

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The oscilloscope screenshots that we took during the hold-up time measurements:

The hold-up time is long and the power ok signal is accurate.

Inrush Current

For details on our inrush current testing, please click here.

The inrush current with both 230V and 115V is higher than the competition.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the unit’s efficiency. The applied load equals (approximately) 10 to 110 percent of the power supplies maximum load in increments of 10 percentage points.

We conducted two additional tests.

During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a power supply is compatible with Intel’s C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Test # 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
1 8.056A 2.008A 1.985A 0.982A 120.059 85.305% 570 11.2 40.14°C 0.960
12.223V 4.979V 3.321V 5.092V 140.741 (*143) 44.56°C 115.05V
2 17.091A 3.012A 2.982A 1.181A 239.741 89.842% 572 11.3 40.61°C 0.977
12.220V 4.978V 3.319V 5.079V 266.848 (*264) 45.62°C 115.05V
3 26.451A 3.520A 3.466A 1.382A 359.246 91.254% 576 11.5 41.23°C 0.985
12.220V 4.976V 3.317V 5.067V 393.679 (*389) 47.47°C 115.04V
4 35.883A 4.021A 3.978A 1.583A 479.653 91.693% 578 11.6 41.68°C 0.990
12.219V 4.975V 3.316V 5.055V 523.108 (*519) 48.56°C 115.04V
5 44.956A 5.030A 4.978A 1.785A 599.789 91.635% 615 12.9 42.20°C 0.993
12.218V 4.974V 3.314V 5.042V 654.538 (*651) 50.37°C 115.04V
6 54.025A 6.033A 5.977A 1.989A 719.926 91.327% 695 15.9 42.91°C 0.995
12.219V 4.972V 3.312V 5.029V 788.297 (*784) 51.91°C 115.03V
7 63.071A 7.042A 6.977A 2.193A 839.654 90.894% 787 19.1 43.22°C 0.995
12.217V 4.972V 3.311V 5.017V 923.771 (*918) 53.05°C 115.03V
8 72.179A 8.050A 7.978A 2.399A 960.157 90.276% 870 23.0 43.89°C 0.996
12.216V 4.971V 3.309V 5.003V 1063.585 (*1054) 54.32°C 115.03V
9 81.619A 8.554A 8.467A 2.403A 1079.486 89.594% 970 26.0 44.41°C 0.996
12.215V 4.969V 3.307V 4.996V 1204.870 (*1190) 55.29°C 115.02V
10 90.897A 9.058A 8.985A 3.017A 1199.915 88.767% 1520 39.8 45.90°C 0.996
12.214V 4.968V 3.305V 4.973V 1351.760 (*1330) 57.57°C 115.02V
11 100.740A 9.062A 8.989A 3.021A 1319.960 87.861% 1860 46.4 46.59°C 0.996
12.212V 4.968V 3.304V 4.966V 1502.330 (*1471) 59.17°C 115.01V
CL1 0.146A 15.002A 14.999A 0.000A 126.173 82.849% 785 19.1 42.54°C 0.966
12.236V 4.974V 3.318V 5.105V 152.293 (*155) 50.26°C 115.05V
CL2 100.009A 1.002A 1.000A 1.000A 1234.522 88.837% 1550 40.0 45.87°C 0.996
12.211V 4.969V 3.305V 5.029V 1389.651 (*1364) 56.83°C 115.02V

*Readings acquired by the PSU’s OLED screen.

The load regulation on all rails but the 5VSB one is super tight. Moreover, the fan spins at very low speeds under extreme-fully tough conditions so even with full load at 46°C, the unit’s noise doesn’t exceed 40 dB(A). This is amazing to say the least!

Thanks to the large heatsinks there is no need for increased airflow during high loads at increased operating temperatures. The noise output gap between the Seasonic SSR-1200PD and the Asus offering is huge! Kudos to both Asus and Seasonic for creating such a quiet 1200W PSU.

This is a definitely 80 PLUS Platinum unit since even at the very high temperatures that we test, it is very close to the required levels that this standard sets. We should remind, for another one time, that the 80 PLUS organization tests at a very low ambient (23+-5°C) while we perform our tests at up to 20°C higher temperatures. The hotter the unit’s internals, the largest the effect in its efficiency. Only the bridge rectifiers benefit from high operating temperatures, because their diodes have lower voltage drops as their operating temperature increases.

Finally, if you take a look at the DC/AC Watts column in the table above, you will notice that the AC Watt readings from the PSU’s OLED screen are close to the real ones. Only in very high loads, tests #10 and #11, the deviation is notable.

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