be quiet! Power Zone 2 850W ATX v3.1 PSU Review

Transient Response

20% Load – 20ms

Advanced Transient Response 20% - 50 Hz - No Caps
Voltage Before After Change Pass/Fail
12V 12.231V 12.086V 1.18% Pass
5V 5.087V 4.987V 1.96% Pass
3.3V 3.343V 3.225V 3.53% Pass
5VSB 4.980V 4.924V 1.12% Pass

50% Load -20ms

Advanced Transient Response 50% - 50 Hz - No Caps
Voltage Before After Change Pass/Fail
12V 12.205V 12.088V 0.96% Pass
5V 5.074V 4.988V 1.70% Pass
3.3V 3.330V 3.214V 3.47% Pass
5VSB 4.946V 4.898V 0.98% Pass

The transient response is good at 12V, 3.3V, and 5VSB and decent at 5V.

Transient Response ATX v3.1 Tests

The PSU passes all ATX v3.1 transient response tests, and the 3.3V rail stays above 3.2V on all tests, something that wasn’t the case in the 1000W model.

The 12V rail performs well in these tests.

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