Thermaltake Toughpower XT 775 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 and during all test both were connected to the single +12 V rail present on the power supply.
| 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) | 28 A (336 W) |
| +12VB | 5 A (60 W) | 10 A (120 W) | 16 A (192 W) | 21 A (252 W) | 28 A (336 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) | 1.5 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 | 147.9 W | 298.5 W | 447.6 W | 587.4 W | 764.1 W |
| % Max Load | 19.1% | 38.5% | 57.8% | 75.8% | 98.6% |
| Room Temp. | 45.3° C | 45.3° C | 46.2° C | 45.7° C | 46.1° C |
| PSU Temp. | 46.9° C | 47.7° C | 48.5° C | 50.3° C | 52.0° C |
| Voltage Stability | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 174.9 W | 341.9 W | 516.1 W | 686.0 W | 916.0 W |
| Efficiency | 84.6% | 87.3% | 86.7% | 85.6% | 83.4% |
| AC Voltage | 113.3 V | 111.3 V | 109.2 V | 107.9 V | 105.1 V |
| Power Factor | 0.973 | 0.991 | 0.995 | 0.997 | 0.998 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
The new Toughpower XT 775 W presents an excellent efficiency across the board, but in particular between 310 W and 620 W, where we saw efficiency between 85.6% and 87.3%, which is of course better numbers than the ones presented by the “old” Toughpower XT 750 W model.
As mentioned, Ecos Consulting gave this unit the 80 Plus Silver certification (85% minimum at 20% and 100% loads and 88% minimum at 50% load), but Thermaltake decided to downgrade it to Bronze (82% minimum at 20% and 100% loads and 85% minimum at 50% load). This was a very smart move and Thermaltake deserve our sincere compliments for that, since at higher temperatures this unit can’t present the same efficiency performance as it presented at Ecos Consulting lab (at 23° C).
All outputs were with their voltages within the expected range (+12 V and +5 V always within a tighter 3% range; +3.3 V didn’t want to stay within this tighter range but was still within the allowed 5% tolerance).
But what really improved on this new Toughpower XT was noise and ripple levels. See below the results achieved on test 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 18: +12VA input from load tester at 764.1 W (55.6 mV).
Figure 19: +12VB input from load tester at 764.1 W (53.8 mV).
Figure 20: +5V rail with power supply delivering 764.1 W (14.4 mV).
Figure 21: +3.3 V rail with power supply delivering 764.1 W (19.6 mV).
Now let’s see if we can pull more power from this unit.