Hello!
At present, I am modified Quadra700 of CPU from 25MHz to 33, 35, 37.5, and 40Mhz
The 66MHz frequency has been obtained, but 70, 75, 80Mhz is hard to obtain.
I asked the Japanese specialty store, but it costs about 120 dollars for each type of 5 types of special order.
Digikey, mouser...