In Win Commander II 850 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 the behavior of the reviewed unit 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 powers listed for each test, you may find a different value than what is posted under “Total” below. Since each output can have a slight variation (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. In the “Total” row, we are using the real amount of power being delivered, as measured by our load tester.
The +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During this test, the +12VA input was connected to the power supply +12V1 and +12V2 rails, while the +12VB input was connected to the power supply +12V2 rail.
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA | 6 A (72 W) | 13 A (156 W) | 18.5 A (222 W) | 25 A (300 W) | 31 A (372 W) |
| +12VB | 6 A (72 W) | 12 A (144 W) | 18.5 A (222 W) | 25 A (300 W) | 31 A (372 W) |
| +5 V | 2 A (10 W) | 4 A (20 W) | 6 A (30 W) | 8 A (40 W) | 10 A (50 W) |
| +3.3 V | 2 A (6.6 W) | 4 A (13.2 W) | 6 A (19.8 W) | 8 A (26.4 W) | 10 A (33 W) |
| +5VSB | 1 A (5 W) | 1.5 A (7.5 W) | 2 A (10 W) | 2.5 A (12.5 W) | 3 A (15 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 | 172.8 W | 347.8 W | 509.4 W | 680.5 W | 845.2 W |
| % Max Load | 20.3% | 40.9% | 59.9% | 80.1% | 99.4% |
| Room Temp. | 44.7° C | 45.3° C | 46.6° C | 49.1° C | 47.6° C |
| PSU Temp. | 50.6° C | 50.3° C | 50.7° C | 52.1° C | 54.2° C |
| Voltage Regulation | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 205 W | 400.6 W | 589 W | 800 W | 1010 W |
| Efficiency | 84.3% | 86.8% | 86.5% | 85.1% | 83.7% |
| AC Voltage | 115.7 V | 113.5 V | 111.6 V | 109.4 V | 107.2 V |
| Power Factor | 0.987 | 0.995 | 0.997 | 0.998 | 0.998 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
The In Win Commander II 850 W can really deliver its labeled power at high temperatures.
Efficiency was high, ranging from 83.7% to 86.8%, surpassing with a good margin the requirements for the 80 Plus Bronze certification. Downgrading this unit to 80 Plus Bronze was a very nice move from In Win, because this unit can’t achieve 80 Plus Silver performance under high temperatures.
Voltage regulation was good. On tests one, two, and three, all positive voltages were within 3% of their nominal values. The -12 V output was outside this tighter range, but still within the allowed range. On tests four and five, the +5 V output exited this tighter range, but was still within the proper tolerance. (This output was at +4.83 V and +4.84 V on these two tests.) The +3.3 V output also dropped below the tighter 3% range during test five, at +3.19 V. The ATX12V specification says positive voltages must be within 5% of their nominal values and negative voltages must be within 10% of their nominal values.
Noise and ripple levels were always very low. Below you can see the results for the power supply outputs during test number five. The maximum allowed is 120 mV for +12 V and -12 V outputs, and 50 mV for +5 V, +3.3 V and +5VSB outputs. All values are peak-to-peak figures.
Figure 20: +12VA input from load tester during test five at 845.2 W (24.2 mV)
Figure 21: +12VB input from load tester during test five at 845.2 W (21.4 mV)
Figure 22: +5V rail during test five at 845.2 W (6.2 mV)
Figure 23: +3.3 V rail during test five at 845.2 W (7.8 mV)
Let’s see if we can pull more than 850 W from this unit.