Update- BIOS updated and issue resolved.
Just bought an XPS 8940 11700 system yesterday. Been going through checking that things work. First hitch I ran into was I was only getting 900/mb read on the NVMe but a simple BIOS defaults fixed that. When I put a load on the system the CPU fan and the 80mm case fan spin at turtle speeds. Is something malfunctioning or do I have to change a setting somewhere? I looked through the BIOS and can't find anything fan related and hwmonitor cant read CPU or case fan RPMs. 
XPS 8940, CPU fan and case fan always spinning slow?