I'm not sure what Dell gives you to control the fans on a Nvidia-3060 in a XPS-8950. If you can't find anything, I suppose you can use MSI After-Burner. That's what most of us use on our Alienwares and custom-builds.  
Hello, recently bought an XPS 8950, i712700, 32 gig ram, Nvidia 3060, SSD boot drive.  The fans are quiet enough for my liking but when I'm playing a game or sometimes streaming a video (but to a lesser extent), the computer makes a noise that sounds something like a frog croaking, repeatedly.  It sounds similar to a hard drive being accessed only it's quite loud.  Not really bothered by it but I had read many reviews before buying this comp and many people talked about fan noise but no one mentioned the croaking noise, so I'm wondering if something is wrong.  Is it a normal sound or do I have a cable touching a fan?
XPS 8950, making croaking noise