Amacrox Free Style 85PLUS 650 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.
The +12V1 and +12V2 inputs listed below are the two +12 V independent inputs from our load tester and during all tests the +12V1 input was connected to the power supply +12V1 and +12V3 rails while the +12V2 input was connected to the power supply +12V2 rail.
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12V1 | 5 A (60 W) | 10 A (120 W) | 15 A (180 W) | 20 A (240 W) | 29 A (348 W) |
| +12V2 | 5 A (60 W) | 10 A (120 W) | 14 A (168 W) | 19 A (228 W) | 19 A (228 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 | 137.9 W | 263.9 W | 388.1 W | 521.8 W | 643.4 W |
| % Max Load | 21.2% | 40.6% | 59.7% | 80.3% | 99.0% |
| Room Temp. | 45.8° C | 46.7° C | 45.2° C | 47.7° C | 48.9° C |
| PSU Temp. | 47.2° C | 47.7&de g; C |
48.0° C | 49.5° C | 50.0° C |
| Voltage Stability | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 163.7 W | 307.4 W | 454.6 W | 622.0 W | 785.0 W |
| Efficiency | 84.2% | 85.8% | 85.4% | 83.9% | 82.0% |
| AC Voltage | 114.2 V | 113.1 V | 111.7 V | 109.9 V | 107.9 V |
| Power Factor | 0.980 | 0.992 | 0.996 | 0.997 | 0.998 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
The reviewed power supply can really deliver 650 W at 49° C.
During our tests four and five over current protection (OCP) kicked in when we tried to pull more than 19 A from +12V2 (which is good), so we compensated this by pulling more from the +12V1 input from our load tester (which was connected to the power supply +12V1 and +12V3 rails).
Efficiency was terrific for a product that is going to be introduced on the market for less than USD 85, above 85% when we pulled between 40% and 60% from the labeled wattage (between 260 W and 390 W). When we pulled 20% of the maximum load (130 W) and 80% of the maximum load (520 W) efficiency was still high at 84%. And at full load efficiency was at 82%, perfectly matching its 80 Plus Bronze certification at high temperatures, something not all 80 Plus Bronze-certified power supplies are able to do.
Voltage was within the allowed range and noise and ripple were way below the maximum allowed. At full load noise level at +12V1 input from our load tester was at 35.6 mV, at +12V2 it was at 40.4 mV, at +5 V it was at 32.6 mV and at +3.3 V it was at 27.6 mV. The maximum allowed is 120 mV for the +12 V outputs and 50 mV for the +5 V and +3.3 V outputs. All values are peak-to-peak.
Let’s see if we could pull more than 650 W from the reviewed unit.