Load Testing
Test 1 (116.67W Load – Cold)
| Rail | Load | Voltage | Ripple |
| 12V | 4.84A | 12.08V | 14.2mV |
| 5V | 4.97A | 4.97V | 10.4mV |
| 3.3V | 10.09A | 3.33V | 12.0mV |
| -12V | 0A | -12.32V | 10.4mV |
| 5Vsb | 0A | 4.97V | 23.0mV |
| AC Power | 134.93W | ||
| Efficiency | 86.47% | ||
| Power Factor | 0.64 | ||
Test 2 (205.72W Load – Cold)
| Rail | Load | Voltage | Ripple |
| 12V | 9.68A | 12.09V | 15.0mV |
| 5V | 9.92A | 4.96V | 9.2mV |
| 3.3V | 10.06A | 3.32V | 11.8mV |
| -12V | 0.1A | -12.29V | 9.2mV |
| 5Vsb | 0.99A | 4.96V | 12.0mV |
| AC Power | 234.94W | ||
| Efficiency | 87.56% | ||
| Power Factor | 0.66 | ||
Test 3 (262.99W Load – Warm)
| Rail | Load | Voltage | Ripple |
| 12V | 14.44A | 12.04V | 17.8mV |
| 5V | 9.96A | 4.98V | 9.6mV |
| 3.3V | 10.06A | 3.32V | 13.6mV |
| -12V | 0.1A | -12.3V | 12.6mV |
| 5Vsb | 0.99A | 4.96V | 15.2mV |
| AC Power | 300.25W | ||
| Efficiency | 87.59% | ||
| Power Factor | 0.66 | ||
Test 4 (319.4W Load – Warm)
| Rail | Load | Voltage | Ripple |
| 12V1 | 19.21A | 12.0V | 19.4mV |
| 5V | 9.58A | 4.99V | 9.4mV |
| 3.3V | 10.06A | 3.32V | 14.4mV |
| -12V | 0.1A | -12.32V | 15.2mV |
| 5Vsb | 0.99A | 4.96V | 16.4mV |
| AC Power | 363.59W | ||
| Efficiency | 87.85% | ||
| Power Factor | 0.64 | ||
Test 5 (374.68W Load – Warm)
| Rail | Load | Voltage | Ripple |
| 12V | 23.87A | 11.94V | 20.2mV |
| 5V | 10.02A | 5.01V | 9.0mV |
| 3.3V | 10.06A | 3.32V | 15.0mV |
| -12V | 0.1A | -12.33V | 18.2mV |
| 5Vsb | 0.99A | 4.96V | 17.6mV |
| AC Power | 431.98W | ||
| Efficiency | 86.73% | ||
| Power Factor | 0.64 | ||
Test 6 (402.0W Load – Warm)
| Rail | Load | Voltage | Ripple |
| 12V | 26.19A | 11.91V | 21.0mV |
| 5V | 10.04A | 5.02V | 8.6mV |
| 3.3V | 10.09A | 3.33V | 16.0mV |
| -12V | 0.1A | 12.34V | 19.8mV |
| 5Vsb | 0.99A | 4.95V | 19.4mV |
| AC Power | 466.59W | ||
| Efficiency | 86.16% | ||
| Power Factor | 0.64 | ||
Overload Test (482.23W Load – Warm)
| Rail | Load | Voltage | Ripple |
| 12V | 33.12A | 11.83V | 24.0mV |
| 5V | 10.08A | 5.04V | 8.4mV |
| 3.3V | 10.06A | 3.32V | 17.2mV |
| -12V | 0.1A | -12.35V | 24.4mV |
| 5Vsb | 0.99A | 4.95V | 21.0mV |
| AC Power | 573.71W | ||
| Efficiency | 84.06% | ||
| Power Factor | 0.64 | ||
For a more affordable product, that’s an excellent result. The efficiency stayed above 86%, which is excellent, considering that this power supply is not 80plus certified. Additionally, the recent hot weather meant that the load tester’s exhaust air warmed up much earlier than usual. The power factor never made it past 0.66. This isn’t great, but I’ve seen much worse from other power supplies with no PFC (Power Factor Correction).
The voltage regulation was excellent. The 12V rail never strayed from its nominal value by more than 0.09V, or 0.75%. It started out 12.09V, and dropped to 11.91V, which equates to a drop of 0.18V, or 1.5%. The 5V rail varied between 5.04V and 4.96V, which gives us a maximum deviation of 0.8%, and a variation of 1.6%. The 3.3V rail at 3.32V almost all the time, only rising to 3.33V in Tests 1 and 6. That gives us a deviation of 0.9%, and variation of 0.3%. This is a great result on all of the rails.
I overloaded this power supply to just over 480W (120% Load) without incident. During this test, everything was still very well within spec, but the efficiency dropped considerably, indicating that the power supply was reaching its limits.
| Rail | Test 6 (402W) | Overload Test (482.23W) |
| 12V |  |
 |
| 5V |  |
 |
| 3.3V |  |
 |
| -12V |  |
 |
| 5Vsb |  |
 |
The ripple suppression was also excellent. On the unit I reviewed a while back, the ripple was too high on the 5vsb. This time around, however, things are much better. The ripple stayed well below half the maximum allowed on all of the rails, even during the overload test. It’s possible that there was a problem with my last unit, or an issue with the wiring on the oscilloscope output of my load tester.
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