Just picked up one of these guys:

http://www.forcedperfect.net/hardware/cards/applepowermacintoshupgradecard/

It states that it's a 66mhz 601 chip which "runs at twice the original 68040 processor speed of the computer it is installed in"

I'm missing something - it's @ 66mhz, but on an 840av (40mhz '040) it pops up to 80mhz 601?

Anybody have experience positive / negative with a quadra upgrade? I'm guessing on a 40mhz '040 most 68k native stuff will be much faster than emulating?

Z