Transient Response
20% Load – 20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 11.954V | 11.768V | 1.55% | Pass |
| 5V | 5.090V | 4.874V | 4.25% | Pass |
| 3.3V | 3.325V | 3.070V | 7.68% | Fail |
| 5VSB | 4.978V | 4.870V | 2.16% | Pass |
50% Load -20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 11.932V | 11.755V | 1.48% | Pass |
| 5V | 5.081V | 4.878V | 3.99% | Pass |
| 3.3V | 3.313V | 3.046V | 8.07% | Fail |
| 5VSB | 4.938V | 4.859V | 1.61% | Pass |
The transient response is mediocre overall. Given the outdated design, I didn’t expect better results. That said, Helly should improve the 3.3V rail’s response.
Transient Response ATX v3.1 Tests
The PSU passes all ATX v3.1 transient response tests. The 3.3V rail drops dead low, but the 12V rail keeps its voltage notably above the lowest limit.
The 12V rail’s level drops low in the 200% transient load test but still outperforms three PSUs with more modern platforms.
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