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 | 11.992V | 11.929V | 0.52% | Pass |
| 5V | 5.032V | 4.946V | 1.71% | Pass |
| 3.3V | 3.284V | 3.175V | 3.32% | Pass |
| 5VSB | 5.021V | 4.989V | 0.64% | Pass |
50% Load -20ms
| Advanced Transient Response 50% - 50 Hz - No Caps | ||||
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 11.969V | 11.907V | 0.52% | Pass |
| 5V | 5.025V | 4.942V | 1.65% | Pass |
| 3.3V | 3.273V | 3.158V | 3.51% | Pass |
| 5VSB | 4.978V | 4.943V | 0.69% | Pass |
The transient response with normal loads is excellent at 12V and pretty good at 5V. The deviations are low at 3.3V, but because of the low nominal voltage, the voltage level on this rail drops well below 3.2V once the transient load is applied.
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, but the 3.3V rails drop low.
The 12V rail’s performance is good enough in these tests.
Oh, good timing for this review ;-). Managed to order this psu, for 250€ @Alternate.
It will replace my older BQ DP 12 850W, for more future proof.