I know the CPU is rated at 40MHz and it is being overclocked, but it works at the 50MHz frequency just fine. And to my fingers, the CPU gets as hot as the 50MHz rated FPU. So I don't think overclocking is an issue. Indeed, I think the chips are speed rated not because faster rated chips handle heat better, but because at the time of manufacture, some chips fail to work at higher frequencies, so they just stamp them differently than higher rated chips. But sometimes lower rated chips can work at higher frequencies, as is the case with my CPU. But again, to my fingers, the CPU gets as hot as the FPU, and the FPU is rated at 50MHz.
As to the use of thermal epoxy, I have a bad experience with that. Many years ago, I exchange dialog on Cubeowner.com with others about upgrading the video card on my G4 Cube to a GeForce 3. I swapped out the stock heatsink with a ThermalTake copper heatsink and fan, using Arctic Silver thermal adhesive. The video card died only days later. Of course, that GPU needed a heatsink whereas the CPU and GPU of this accelerator technically do not, but it still worries me. And the fact is, if one wants to add a heatsink, thermal adhesive (epoxy) is the only way to do it, assuming that heatsink would even fit. And using of such a tiny heatsink (a couple RAM heatsinks?) may not make much of a difference anyway.
As to using my photos, you gentlemen are free to do so without attribution. There's too much of this "give me money" or "credit me" stuff these days. Sometimes we ought to just share and enjoy the fact we've helped somebody out. If my photos can do that for some of you, that makes me feel great. And that great feeling is thanks enough. But for those of you who have credited me, I don't treat that flippantly. Thank you for your kindness.
