I remember reading a guide from IBM about training the memory path of some Power architecture system. The tl;dr; was essentially "Follow <big set of rules for c

I remember reading a guide from IBM about training the memory path of some Power architecture system. The tl;dr; was essentially "Follow <big set of rules for circuit board layout> exactly, as if your life depended on it, and spend six months tuning and qualifying parts." It's amazing that anything works at all.