Transient Response
20% Load – 20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.028V | 11.843V | 1.54% | Pass |
| 5V | 5.088V | 4.870V | 4.28% | Pass |
| 3.3V | 3.326V | 3.105V | 6.63% | Fail |
| 5VSB | 4.996V | 4.890V | 2.13% | Pass |
50% Load -20ms
| Voltage | Before | After | Change | Pass/Fail |
| 12V | 12.006V | 11.824V | 1.52% | Pass |
| 5V | 5.081V | 4.865V | 4.24% | Pass |
| 3.3V | 3.312V | 3.081V | 6.97% | Fail |
| 5VSB | 4.958V | 4.860V | 1.98% | 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 Given the outdated design, I didn’t expect better results.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. Contrary to the 800W model, the 750W unit keeps the 3.3V rail above 3.2V.
The 12V rail’s level drops low in the 200% transient load test but still outperforms four PSUs with more modern platforms.
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