I recently got PowerEdge 1750 and I was also annoyed by the noise it made in the beginning. I updated Bios, ESM, everything that the Dell support page offers. It had the dual power supply unit. When I plugged both power supplies, the noise reduced quiet a bit. There is some logic that Dell Bios/ESM is considering dual power supply to control its fan speed. I would suggest trying to get second power supply unit, plug it and see. Let me know if I am a bit hasty in attributing this to the second PSU.
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