How exactly have you tested your PSU? Just FYI, I have little faith in the monitoring and reporting tools built into Corsair digital PSUs. A proper PSU testing device or DMM measurements would be far more reliable and accurate for diagnosing a bad PSU.
The easiest way to rule out PSU-related faults is to swap PSUs. Try a known-good PSU in your stuttering platform, try the questionable PSU in a known-good platform.
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