Commodore 64/64C?

Mostly, there are some motherboard design difference between the two. However, it is known that you can actually swap the boards between the two if you preferred one case over another and have a bad unit. There were at least 4 different board revisions, so some boards may not move to another case. Another thing you might notice is the power supply connector is different. There was a connector redesign between the newer (aka 'flat C64') and older (aka 'Breadbox') C64's. The flat 64 has a square connector where the breadbox 64 has a round one. The flat 64 also has a different component layout due to IC consolidation. Maybe those newer chip designs are what's overheating your system. Or it could be the fact that the parts are closer to the outside of the case. I'm toying with the idea of swapping boards in my systems. I only heard that it can be done. I want a functional version of each and I have 2 working flat units and 7 dead breadboxes (of which I salvaged parts from to get an SX-64 working). For my display units, I would like one of each design in working order. Hope this helps, Jeff Salzman