Transient Response
Transient response in power supplies refers to how quickly and effectively the PSU stabilizes its output voltage during sudden changes in load demand, such as when a CPU or GPU increases its power draw. It’s measured by the time and voltage deviation during these shifts. A faster, smaller transient response ensures stable power, preventing instability and component damage.
20% Load – 20ms
| Advanced Transient Response 20% - 50 Hz - No Caps | ||||
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.036V | 11.945V | 0.75% | Pass |
| 5V | 5.055V | 4.959V | 1.90% | Pass |
| 3.3V | 3.316V | 3.142V | 5.26% | Pass |
| 5VSB | 5.032V | 4.996V | 0.71% | Pass |
50% Load -20ms
| Advanced Transient Response 50% - 50 Hz - No Caps | ||||
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.019V | 11.926V | 0.77% | Pass |
| 5V | 5.055V | 4.936V | 2.35% | Pass |
| 3.3V | 3.320V | 3.138V | 5.49% | Fail |
| 5VSB | 4.985V | 4.937V | 0.96% | Pass |
The transient response with normal loads is excellent at 12V, acceptable at 5V, and mediocre at 3.3V.
Note that the ATX spec requires additional capacitance for these tests, which helps boost voltage levels. In contrast, the results you see above are without any additional capacitance on any of the rails, so the stress is way higher.
Transient Response ATX v3.1 Tests
[Note] For PSUs without a 12+4 pin connector, the maximum applied load for the transient response tests is 150%, rather than 200%.
The PSU passes all ATX v3.1 transient response tests.
The 12V rail’s performance is good enough in these tests.
Leakage current graph is for the 1000W models so wrong graph used here, too bad your graphs don’t include Pure Power 13 M , that model seems to be a better value and maybe better unit than this.
BQ can snatch loyal Seasonic and Corsair users with these 2025 models, good job from them. Thanks for the review!
Do you think that the Dark Power 14 worth the premium over the Pure Power 13 M?
…in addition, Pure Power has more compact dimensions 160 vs 175 (Dark Power) and fits into e.g. Lancool 207, or Sugo 14, while Dark Power does not 😉