I managed to find very small 2.5 x 2.5 cm heatsink plus fan combinations that are no higher than 8 mm. These were expensive and could only purchased through a dealer specialising for notebook equipment (they were manufactured by EKL) but fit the Apollo very well. 3.5 x 3.5 cm would be ideal for the 68030 CPU, 2.5 x 2.5 cm for 68882 FPU if you use one. Always cool both!

The small MACH chips on the Apollo, below the 68030 and 68882 chips do get hot, too. These might not necessarily need active cooling but give them small heatsinks.

Use larger fans to blow warm air out of the case through the "radiator" on the top of the A600. Make sure that you get a defined air flow, from the front of the case over the Apollo to the back. Do so by closing all openings where the air should NOT flow in with duct tape or the like.

You'll get the necessary power for the fans from the disk drive connector which provides both 5V and 12V. Make sure not to mix up 5V and 12V, this will kill your fans!

The pinout from left to right as shown in this picture is:

5V  GND GND 12V

Once you've had the A600 running stable with all the cooling suggested for an hour or so, switch it off, make sure to statically unload yourself and touch the 68030 processor and the FPU. Do they still get hot? Then you'll need more cooling. If they are warm but can be touched without burning your fingers, you should be on the safe side.

This shows the upgraded Amiga 600 with all its fans and heatsinks in place:

and this is a closeup of the Apollo with its fans and heatsinks. As always: Click on the picture for a large version. Note the empty FPU socket. My FPU died while operating the Apollo uncooled for too long!

This shows the finished Amiga 600 from another angle. This also shows how we've closed the radiator on top of the Amiga 600 with duct tape to get a defined air flow generated by the fan. The fan was carefully screwed between the ribs of the radiator and the screws then insulated with duct tape.