@Hyperspeed
as already pointed by Castellen, thers no way to determinate the exact clock via software even using the good WhichAmiga by Piru.
WhichAmiga is the most precise tool for the 68k side, but sometimes fails to check the exact clock (and FSB also) of a PPC (just a little).
About the heating, not only the CPU is involved.
I have followed the optimal suggestions of Dave's page (a little fan on the ram controller) CSPPC related but useful even for other enviroments.
EDIT- btw . . .nice
Michal heatsink