Well I've tested Sega CD and 32X on my Pi Zero. I used the overclock I mentioned above but with overvolt 2 instead of 6. Sega CD works flawlessly on FMV games and games that use scaling/rotation. Sega 32X is so close to full speed it hurts, but its not quite there. I'm sure if I could squeeze another 100 MHz out of the CPU safely it would work at full speed. It's funny because I remember 32X working good on my Pi1, just not PSX or above. That was a few RetroPie versions back however. This will eventually be a handheld system so active cooling is not really an option. As a result I will likely have to leave 32X out unfortunately, unless performance improves when I lower the screen resolution for the LCD. Out of curiosity, has anyone ever pushed a Pi1 or Pi Zero to 1100 MHz? If so was it stable? How about temperature under load?