Sonnet makes a product called QuadDoubler, which is a 100/50MHz
accelerator for certain Quadra models (notably the Q700 and C650.) The
price of a Q700 plus the price of the processor is less than the price of
the Q840av that was being thrown around here earlier. Does this product
work with an unmodified NetBSD kernel? Shouldn't this be faster than the
Q840av? I thought for sure someone would have mentioned this by
now...isn't anybody using one?

The mention of 68060 powered Amigas sent me back through my pre-powerpc
mac-upgrade literature, and several vendors promised 68060 upgrades for
Quadra macs. Did any of these ever materialize as actual products?