UNSOLVED Dell Optiplex 7050's
Interesting, I just tested a 7050 and it pxe booted and registered correctly. The only exception here is that the model we are purchasing still has the 6th generation CPU (skylake) processors installed. Let me boot it and see what nic is installed.
The bios version is 1.5.2 on these systems. The arrived on 19-Sept-17 so they should be the latest version.
So which BIOS version do you have installed?