Yes, the Daystar Powerpro 601 was for the 68040 machines. Even those are not worth it (unless you get the one with 1MB cache and 4 x 72 pin SIMMs) unless you absolutely need one for an AVID system.

All those stop gap upgrades are still cool to own and play with but were only realy useful to users during the brief switch from 68K to PPC where new machines cost a mint and the upgrade kept you working for a few years without having to buy a new machine. It took a while for memory prices to drop and HD speeds to get faster to show how bad a PPC chip would run in an old 68K design.