In Win Diva Case Review
The Power Supply: Load Test
Contents
Please read our article Hardware Secrets Power Supply Test Methodology to understand our power supply testing methodology.
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 +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During this test both inputs were connected to the power supply single rail (+12VB input was connected to the power supply ATX12V connector and all other cables were connected to the load tester +12VA input).
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA | 1 A (12 W) | 2 A (24 W) | 3 A (36 W) | 4.5 A (54 W) | 5.5 A (66 W) |
| +12VB | 1 A (12 W) | 2 A (24 W) | 3 A (36 W) | 4 A (48 W) | 5.5 A (66 W) |
| +5V | 1 A (5 W) | 1 A (5 W) | 1.5 A (7.5 W) | 1.5 A (7.5 W) | 2 A (10 W) |
| +3.3 V | 1 A (5 W) | 1 A (5 W) | 1.5 A (4.95 W) | 1.5 A (4.95 W) | 2 A (6.6 W) |
| +5VSB | 1 A (5 W) | 1 A (5 W) | 1 A (5 W) | 1 A (5 W) | 1 A (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 | 43.5 W | 67.5 W | 95.7 W | 125.4 W | 159.2 W |
| % Max Load | 27.2% | 42.2% | 59.8% | 78.4% | 99.5% |
| Room Temp. | 25.7° C | 27.6° C | 29.5° C | 32.0° C | 32.8° C |
| PSU Temp. | 26.0° C | 30.9° C | 34.9° C | 40.9° C | 42.2° C |
| Voltage Regulation | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 56.2 W | 82.2 W | 114.8 W | 149.9 W | 191.2 W |
| Efficiency | 77.4% | 82.1% | 83.4% | 83.7% | 83.3% |
| AC Voltage | 116.9 V | 117.3 V | 116.5 V | 115.7 V | 115.6 V |
| Power Factor | 0.986 | 0.993 | 0.991 | 0.987 | 0.986 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
In Win Diva comes with a good power supply, that can really deliver 160 W. Efficiency could be better under or first test, when we were pulling 43.5 W from it, but we don’t think this power is realistic even for a PC with very low power consumption. On all other load patterns we saw efficiency on the 82-83% range.
Voltages were always within 3% of their nominal values – i.e., they were closer to their “official” values than required, which is good (ATX12V specification allows a 5% tolerance for all positive voltages and 10% for -12 V).
And noise and ripple were always below the maximum allowed, even though a little bit higher than we like to see during test five at 159.2 W. You can see noise levels during test five below. The maximum allowed is 120 mV on +12 V and 50 mV on +5 V and +3.3 V. All numbers are peak-to-peak figures.
Figure 16: +12VA input from load tester at 159.2 W (90.6 mV).
Figure 17: +12VB input from load tester at 159.2 W (90.6 mV).
Figure 18: +5 V rail with power supply delivering 159.2 W (21.2 mV).
Figure 19: +3.3 V rail with power supply delivering 159.2 W (11.4 mV).