View: https://youtu.be/RbhfZ2UXc4w?
Succinct yet still reasonably detailed analysis of the poor chassis thermal design issues in the Dell Optiplex GX260, GX270, GX280 era desktop clamshells, amplified by some flawed design choices in the CPU fan. Includes some actual temperature testing which, while not detailed, shows they do a nice toasty 60C internal at idle and 67C at load… aka ouch.