Bothered by the constant loud fan noise eminating from your Dell XPS 8930 tower? I know I was. The constant up down of the fans, sometimes spinning full blast on minor CPU usage.

I found this article which pointed to the fix, which seems to work!

Start
Control Panel
Power Options
Change plan settings on whatever plan you have selected
Change advanced power settings
Scroll down to Processor power management and set your minimum and maximum processor state values like so: