Question Dell Precision 5820 CPU maxed out

Apr 21, 2021
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Dell Precision 5820 with Intel Xeon W-2123 CPU (4 core).
Frequent BSOD or just immediate shutdown when multiple programs open and trying to stream video or Spotify.
Resource monitor shows an average of 90% CPU utilization, even right after a fresh reboot with no open applications.
No virus, no spyware.
Generally System is the highest CPU utilization.
I ran a benchmark program which froze when hitting my second video card (ATI Firepro V4800). The other card is a Nvidia Quadro P4000.
I have 7 monitors and 2 graphics cards.
Am I expecting too much from this system?
Is it possible to upgrade the CPU to an 8 core W-2245 ?
This system is a 2019 model and cost a bundle. I'd hate to have to upgrade the whole thing.
Thanks !