... fond old memories of replacing a dud 4K DRAM on a Vax 11/780, all on my own (the company I was working for was too cheap to pay for a DEC service contract).

Unfond, more recent memories of being asked by the Dell support tech to remove all the DIMMs in the server and start putting them back, one by one.

48 DIMMs. 15 minute BIOS boot time. Didn't even bother doing the math.

It was a better use of our time and money to mention "contractual four hour response time" and "We're about to send email to our corporate lawyer, do you want to reconsider your support response?"