Overclocking is software controlled, some programs like GPDoom and GPEngine allow you to overclock within the game menu, but most others don't. I have overclocked versions of SnesEmu, GenEmu and Snes9xGp at various speeds on my site GP32 World. remember to start with a low speed (140Mhz) and work your way up. The highest recorded working speed is 166Mhz, but I have emulators available at higher speeds if you want to risk trying them