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R620 server. Silent whenusing psu1. Loud using psu2

I have a Dell server with two power supplies. Both power supplies are connected to a different UPS. When the server is connected to  power supply number one it is very quiet the fans are barely running. When connected to just the second power supply the fans run very loud and the server is very loud.  Why?
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Sounds like a PS problem. Have you swapped the connections to isolate the PS or UPS? If the server is under warranty (Dell?), maybe open a case.
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Casey Weaver
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I've requested that this question be deleted for the following reason:

no answer
There were answers given, and we don't know if the answer was right or wrong. If there was no chance to test the user should say so, but it almost comes through as an answer they didn't want to hear.
Was a firmware update. Fixed the issue.
The lifecycle controller platform. Even though it said no updates were needed, there were updates. I checked several times and everything was up to date. Then checked several times within a two week period and updates were there. Dell updates their repositories. Thank you for your help.