MJ313 said:

It does run hotter... but Uniserver's kind of been-there, done-that, so hopefully he will chime in.  It seems the 25Mhz 040's all have passive heatsinks when installed by Apple (like in the Q700). I guess they are there for a reason.

https://68kmla.org/forums/index.php?/topic/20913-full-040-in-a-575-need-a-heat-sink/?hl=heat+sink

Click to expand...

Fortunately mine's an MC68040RC40A marked 02L88M, which apparently means it's a more recent production with a smaller die:

http://eab.abime.net/showthread.php?p=647148#post647148

But I should probably pop a heat sink on there just in case.  I bet I've got something in my basement parts dungeon that would work.

Oh, and is there a way to monitor the temperature?