Intel® Core® processors ending with the letter F (starting with 9th Generation Intel® Desktop Processors) and Intel® Core™ X-series Processors (processors number ending with X ) do not have Intel® Processors Graphics. You can always choose a different model which can support processors with integrated graphics.  The 5820 is not one of them.
I have just ordered Precision Tower 5820 (i-9 series).My dell screen has only HDMI.Precision 5820 has only one male 9-pin serial port from the back (no added graphic card), and USB-C in front.I tried to connect different USBC-HDMI adapters. Am i supposed to you the 9-pin serial port?  
Precision Tower 5820 has no HDMI/VGA/DP ports