Tuniq Potency 750 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 +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During our tests +12VA input was connected to the power supply +12V1 and +12V3 rails while the +12VB input was connected to the power supply +12V4 rail.
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA | 5 A (60 W) | 11 A (132 W) | 16 A (192 W) | 22 A (264 W) | 27 A (324 W) |
| +12VB | 5 A (60 W) |
10 A (120 W) | 16 A (192 W) | 21 A (252 W) | 27 A (324 W) |
| +5V | 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 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 | 149.8 W | 295.6 W | 453.9 W | 603.9 W | 753.8 W |
| % Max Load | 20.0% | 39.4% | 60.5% | 80.5% | 100.5% |
| Room Temp. | 45.6° C | 45.9° C | 46.8° C | 47.3° C | 47.1° C |
| PSU Temp. | 49.6° C | 50.4° C | 51.1° C | 52.6° C | 52.0° C |
| Voltage Stability | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Failed on -12 V |
| AC Power | 187.6 W | 349.9 W | 538.2 W | 724.0 W | 924.0 W |
| Efficiency | 79.9% | 84.5% | 84.3% | 83.4% | 81.6% |
| AC Voltage | 113.6 V | 111.6 V | 110.6 V | 109.0 V | 105.8 V |
| Power Factor | 0.980 | 0.991 | 0.994 | 0.995 | 0.996 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
Tuniq Potency 750 W was able to deliver its labeled power at high temperatures.
Efficiency was high when we pulled between 40% and 80% from the unit’s labeled wattage (between 300 W and 600 W), but at light load (20% load, i.e., 150 W) and full load (750 W) efficiency was below the 82% promised by the 80 Plus Bronze certification. This happens because Ecos Consulting, the company in charge of 80 Plus, tests units at 23° C, a temperature that is too low in our opinion, and the higher temperature, the lower efficiency is. Click here for more information on this subject.
Voltage stability was one of the highlights from Tuniq Potency 750 W, with all voltages inside 3% of their nominal values, i.e., voltages were closer to their nominal value than needed, as ATX12V spec allows voltages to be up to 5% from their nominal values (10% for -12 V). This includes the -12 V output, which usually doesn’t like to stay within a tolerance this tight.
Noise and ripple were relatively low all the time, except -12 V during test five, which surpassed the 120 mV limit by staying at 137.6 mV. Below you can see the results for test number five. As we always point out, the limits are 120 mV for +12 V and 50 mV for +5 V and +3.3 V and all numbers are peak-to-peak figures.
Figure 16: +12VA input from load tester at 753.8 W (60.6 mV).
Figure 17: +12VB input from load tester at 753.8 W (60.4 mV).
Figure 18: +5V rail with power supply delivering 753.8 W (26.6 mV).
Figure 19: +3.3 V rail with power supply delivering 753.8 W (23.0 mV).
Now let’s see if we could pull more than 750 W from this unit.