2voodoo
yes, for 040-33mhz - 66mhz oscil, for 040-40mhz - 80mhz oscil. I do not have any modules/tests with my old 040-40mhz cpu, only with 040-33, if you want i can send it to you. Speed of all transfers betwin 040-25 and 040-33 REALLY extreme. Only 8mhz, but it is very nice for work. 40mhz of course good too.
Now i have (as i said bellow) 060-66 on my bppc, so, can't do it any tests about 040-40. sorry.
anyway, i want to say, that i do not used any cooler for my speedup cpu (33mhz), but cpu was very hot (but work stable). For 40mhz i used cooler (but without cooler it work nice too)