Amacrox Free Earth 85PLUS 650 W Power Supply Review
Load Tests (Sample 2)
Contents
Since the sample we received from Amacrox presented the problems described in the previous page, we requested a second sample from them. The results for this new sample were quite different during test five: we could pull 650 W continuously and with the current configuration we wanted.
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA | 5 A (60 W) | 10 A (120 W) | 15 A (180 W) | 20 A (240 W) | 24.5 A (294 W) |
| +12VB | 5 A (60 W) | 10 A (120 W) | 14 A (168 W) | 20 A (240 W) | 24.5 A (294 W) |
| +5V | 1 A (5 W) | 2 A (10 W) | 4 A (20 W) | 6 A (30 W) | 8 A (40 W) |
| +3.3 V | 1 A (3.3 W) | 2 A (6.6 W) | 4 A (13.2 W) | 6 A (19.8 W) | 8 A (26.4 W) |
| +5VSB | 1 A (5 W) | 1 A (5 W) | 1.5 A (7.5 W) | 2 A (10 W) | 2.5 A (12.5 W) |
| -12 V | 0.5 A (6 W) | 0.5 A (6 W) | 0.5 A (6 W) | 0.5 A (6 W) | 0.5 A (6 W) |
| Total | 136.8 W | 261.7 W | 384.9 W | 529.1 W | 648.3 W |
| % Max Load | 21.0% | 40.3% | 59.2% | 81.4% | 99.7% |
| Room Temp. | 44.7° C | 43.8° C | 44.0° C | 45.1° C | 47.5° C |
| PSU Temp. | 49.7° C | 49.7° C | 49.9° C | 51.0° C | 53.6° C |
| Voltage Stability | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 162.3 W | 304.2 W | 450.6 W | 632.0 W | 793.0 W |
| Efficiency | 84.3% | 86.0% | 85.4% | 83.7% | 81.8% |
| AC Voltage | 115.4 V | 113.8 V | 112.4 V | 110.5 V | 108.3 V |
| Power Factor | 0.977 | 0.989 | 0.993 | 0.996 | 0.998 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
This time Amacrox Free Earth 85PLUS 650 W passed with flying colors. Efficiency was always above 81.8%, peaking 86%.
Voltages were always inside the allowed range.
Noise and ripple, which were already low on the first sample, decreased a lot on the second sample, as you can see below. The maximum allowed is 120 mV on +12 V and 50 mV on +5 V and +3.3 V. All these numbers are peak-to-peak figures.
Figure 20: +12VA input from load tester during test five at 648.3 W (28.6 mV).
Figure 21: +12VB input from load tester during test five at 648.3 W (32.2 mV).
Figure 22: +5V rail during test five at 648.3 W (13.6 mV).
Figure 23: +3.3 V rail during test five at 648.3 W (26.4 mV).
Now let’s see if we can pull more than 650 W from this unit.
