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Riotoro 1200W Builder Edition PSU Review

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:

Unfortunately the hold-up time is too small and to make matters even worse, the power ok signal is not accurate.

Inrush Current

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

The inrush current is low with both voltage inputs, given the unit’s high capacity. Given the small capacity of the bulk caps and the proper inrush current protection, which usually is absent in High Power’s platform, we didn’t expect anything different here.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the PR-GP1200FM’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 8.173A 1.988A 1.979A 1.002A 119.969 89.536% 753 18.3 40.07°C 0.983
12.038V 5.029V 3.332V 4.992V 133.990 42.62°C 115.10V
2 17.335A 2.984A 2.970A 1.204A 239.718 91.759% 756 18.3 40.63°C 0.995
12.046V 5.027V 3.332V 4.983V 261.247 43.82°C 115.09V
3 26.855A 3.489A 3.460A 1.410A 359.226 91.878% 1020 26.3 41.48°C 0.996
12.036V 5.016V 3.322V 4.964V 390.980 45.49°C 115.10V
4 36.448A 3.988A 3.971A 1.615A 479.681 91.783% 1025 26.4 41.88°C 0.998
12.031V 5.016V 3.323V 4.956V 522.626 46.65°C 115.10V
5 45.641A 4.987A 4.966A 1.820A 599.831 91.285% 1030 26.4 42.48°C 0.998
12.036V 5.014V 3.322V 4.947V 657.095 49.35°C 115.18V
6 54.927A 6.001A 5.960A 2.031A 719.937 90.133% 1210 30.9 42.71°C 0.998
12.019V 5.000V 3.322V 4.926V 798.747 49.50°C 115.18V
7 64.085A 7.004A 6.956A 2.238A 839.705 89.303% 1525 38.0 43.51°C 0.999
12.025V 4.998V 3.321V 4.916V 940.290 51.02°C 115.09V
8 73.251A 8.008A 7.951A 2.446A 960.138 88.477% 1530 38.0 43.73°C 0.999
12.037V 4.996V 3.320V 4.906V 1085.184 51.50°C 115.09V
9 82.776A 8.509A 8.431A 2.446A 1079.501 87.445% 1700 40.6 44.81°C 0.999
12.044V 4.996V 3.321V 4.906V 1234.492 54.82°C 115.09V
10 92.276A 9.011A 8.945A 3.075A 1200.011 86.270% 1715 40.8 45.34°C 0.999
12.032V 4.995V 3.320V 4.879V 1390.997 59.07°C 115.10V
11 97.377A 9.011A 8.957A 3.071A 1259.722 86.507% 1695 40.6 28.37°C 0.999
12.015V 4.994V 3.316V 4.886V 1456.200 42.37°C 115.09V
CL1 0.142A 16.001A 16.000A 0.000A 135.073 83.302% 760 18.4 40.11°C 0.984
12.068V 5.020V 3.316V 5.029V 162.149 50.09°C 115.12V
CL2 89.297A 1.001A 0.998A 1.000A 1086.254 87.932% 1690 40.5 29.85°C 0.999
12.015V 5.003V 3.318V 4.971V 1235.336 41.13°C 115.10V

When tested at up to 50% load, the fan spins at low speeds, hence the unit’s noise is kept low. It starts to get noticeable in the next test and in the worst case scenario it barely exceeds 40 dB(A). The fan profile is not aggressively tuned, that’s for sure, since even with full load at 45°C it doesn’t allow the fan to spin at its full speed.

Unfortunately the PSU isn’t able to deliver 110% of its full power but it can go up to 105% only (1260W) and this is at normal operating temperatures and not >40°C. It isn’t also able to deliver more than 90 Amps on the +12V rail during the CL2 test, although its paper specifications mention about 100A on this rail. Those facts lead us to believe that High Power was super conservative with the over power and over current protection features.

With 20% and 50% of its max-rated capacity the unit meets the 80 PLUS Gold standard’s requirements, but with full load it fells short. Nonetheless, we apply much more stress than 80 PLUS since we test with higher temperatures, so efficiency takes a hit.

The load regulation is very tight on all rails, especially at +12V which is the most important rail.

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