Many moons ago, and it was mostly a developer telling a sysadmin "My code should be working a lot better than this!" and the admin saying something about "I told you, your shitty code isn't taking advantage of the awesomeness in this AMD chip!"

I think it was back in the day of the Pentium III vs some AMD Athlon. I don't remember the conversation verbatim, i was too busy petting my G4.