I am of course paraphrasing, and I desperately want to find the original quote, and I say again, I might be incorrect in what was said, but that's what *I* recall seeing him say.
"The quote is out there ..." ;-)
Anyway, my own recollection goes more towards jahc's version in this case. And I think it was meant something like "if you downclock/degrade different components of the system until it runs *100%* stable while the Northbridge is shoveling huge amounts of unique data criss cross between different PCI/IDE units for a looong period of time, without a single case of data corruption, then the overall system performance of a Pegasos G3 with April2 will outperform the A1 with G4".
But that's just as much speculation as yours, and my interpretation is probably wrong anyway ;-) ...