I did a huge heap of research into audio computers.
Every thing pointed from the start to 7200rpm drives.
As has been alluded to having usb drives plugged in (exterior drives) to the wrong place re hubs do cause errors etc.
These Dells I have had a few and always had trouble even knowing the routing of the usb section. Our new Lenovo has problems re keyboard.This is not my audio computer.
There are far more capable people on the forum to give you advise on this however as per the 7200rpm drives they are the go for audio.
I run a 32GB Ram WITH TWO 7200RPM hd'S and a SSD Primary drive I have no trouble.
Best
Grinder
https://soundcloud.com/steve-maitland-1