Enermax ECO80+ 620 W Power Supply Review
Load Tests
Contents
We conducted several tests with this power supply, as described in the article Hardware Secrets Power Supply Test Methodology.
First we tested this power supply with five different load patterns, trying to pull around 20%, 40%, 60%, 80%, and 100% of its labeled maximum capacity (actual percentage used listed under “% Max Load”), watching how the reviewed unit behaved under each load. In the table below we list the load patterns we used and the results for each load.
If you add all the power listed for each test, you may find a different value than what is posted under “Total” below. Since each output can vary slightly (e.g., the +5 V output working at +5.10 V), the actual total amount of power being delivered is slightly different than the calculated value. On the “Total” row we are
using the real amount of power being delivered, as measured by our load tester.
+12V1 and +12V2 are the two independent +12V inputs from our load tester and during our tests the +12V1 input was connected to the +12V1 (main motherboard connector) and +12V2 (video card and peripheral power connectors) rails, while the +12V2 input was connected to the +12V1 (EPS12V connector) rail.
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12V1 | 5 A (60 W) | 9 A (108 W) | 14 A (168 W) | 19 A (228 W) | 24 A (288 W) |
| +12V2 | 4 A (48 W) | 9 A (108 W) | 14 A (168 W) | 18 A (216 W) | 23 A (276 W) |
| +5V | 1 A (5 W) | 2 A (10 W) | 4 A (20 W) | 5 A (25 W) | 6 A (30 W) |
| +3.3 V | 1 A (3.3 W) | 2 A (6.6 W) | 4 A (13.2 W) | 5 A (16.5 W) | 6 A (19.8 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 | 130.5 W | 249.2 W | 389.7 W | 509.4 W | 638.7 W |
| % Max Load | 21.0% | 40.2% | 62.9% | 82.2% | 103.0% |
| Room Temp. | 45.9° C | 45.7° C | 49.6° C | 46.2° C | 46.5° C |
| PSU Temp. | 48.2° C | 46.9° C | 50.6° C | 52.3° C | 53.0° C |
| Voltage Stability | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 155.5 W | 292.3 W | 462.7 W | 617.0 W | 797.0 W |
| Efficiency | 83.9% | 85.3% | 84.2% | 82.6% | 80.1% |
| AC Voltage | 113.3 V | 111.8 V | 109.4 V | 107.7 V | 104.1 V |
| Power Factor | 0.957 | 0.972 | 0.982 | 0.987 | 0.990 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
Enermax ECO80+ 620 W presents high efficiency between 84% and 85% if you pull up to 60% from its labeled capacity, i.e., up to 372 W. At 80% load (496 W) efficiency dropped to 82.6%, still a good number. At full load (620 W) efficiency dropped to 80%.
Voltage stability is another highlight from this product. All voltages (including -12 V) were within 3% from their nominal value, whereas the ATX specification says they must be within 5%. Translation: voltages were closer to their nominal values than needed.
Ripple and noise were extremely low. You can see the results for test number five below. All numbers are peak-to-peak figures and the maximum allowed is 120 mV for the +12 V outputs and 50 mV for the +3.3 V and +5 V outputs.
Figure 16: +12V1 input from load tester at 638.7 (45.4 mV).
Figure 17: +12V2 input from load tester at 638.7 (45.0 mV).
Figure 18: +5V rail with power supply delivering 638.7 (14.2 mV).
Figure 19: +3.3 V rail with power supply delivering 638.7 (11.4 mV).
Let’s see if we could pull more than 620 W from this unit.