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In Control Panel under 'Power Options' I chose my default Dell power plan and picked 'Edit Plan Settings' then chose 'Change Advanced Power Settings'. I then went down to 'Processor Power Management' and changed 'Maximum Processor State' from 100% to 90%. I also set 'System Cooling Policy' to 'Passive'.

Stopping the CPU from hitting 100% has stopped the PSU fan from revving like a jet engine. My system is much quieter now during gaming."

Not sure if this will work for you, but it's worth a try.

Additionally, here is information from the Dell knowledge base you may find helpful:

I have the same issue with Inspiron 14 5000. Never heard fan working before 20HC update, now it is running most of the time even CPU usage is down to 20%. I did reinstall clean Windows 10 again, then everything was fine again. 

I removed update from Windows 10 and fan went back to normal mode of operation. I am working with audio files, so I can't really have that fan noise in the background.