Selling old PC’s vs. stripping precious metal

I have recently come into a bunch of old Dell Precision workstations from and upgrade/install. It is a mix of 530’s 650’s and a 670. I was gonna strip them down of the useful parts and Ebay them (although it looks like some of the parts ain’t gonna be worth much if anything). Then I got to thinking about something someone told me once about there being precious metal in computers.

Anyone have any experience with that? Is there enough precious metal in 8 computers to make it worth my time and effort? Does anyone have any good resources on the process? Everything I have Googled to this point has been vague at best.

Any help/advice is appreciated

:ar!