My 030/25 overclocked to 40mhz used to operate around 15 degreed C over ambient, so about 35 on a 20 degree day which is cool. I had fitted a small heatsink to the PLCC, stuck on with thermal glue, without it, the heat output was worrying.
If you wanted, you could scrounge an old heatpipe/heatsink/fan assembly from a laptop, many have very low profile unit that adds about 5mm to chip height.
As for running huge amount of RAM in an Amiga, I noticed access speed drop with larger sticks, I guessed it was because of additional adressing overhead?
