I'm yet to have a DOA (or even dead within 4 weeks+) 5xxx CPU, I have to wonder how much of the DOAness (new word) is down to incorrect (component/knowledge/BIOS) etc. I fixed a supposed DOA 5800X system by demonstrating that the PSU wasn't providing a good +12v rail causing system instability that looked like a bad CPU.
sometimes I would agree with you but in this case he is one of the owners of the local computer/repair shop
popped in to grab something quick