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I checked it all on Snes9x 1.60 with rom of Star Fox 2 from SNES mini.
Only MAME has an option to change the main CPU frequency, which requires you to enable cheats. MAME SNES emulation is very demanding by default and activating the overclock only makes it worse. It is more stable than the real hardware while overclocked and won't exhibit the same issues, but it is still very unstable especially if you adjust the frequency multiple times. It also does not allow you to go over 250% clock speed, which isn't enough to fully get rid of slowdowns in some games.
The latest builds standalone version of all [[Snes9x]] and all it [[libretro ]] cores builds can overclock by reducing the number of emulated CPU/memory access cycles from 6, 8, and 12 to either 4, 5, and 6 (Compatible) or 3, 3, and 3 (Max) respectively. Just for comparison, that means the Max option is effectively 7.16 MHz. Gameplay is not sped up (assuming the game is not in a constant state of some slowdown, to begin with, like Out of This World) and the issues experienced on real hardware are not present, though stability will vary depending on the game and which option you use. Also to note, some games may work better with the Max option rather than Compatible, as appears to be the case for Mega Man X1 which has a bit of graphical corruption under very specific conditions when using the Compatible option, so try both if you encounter issues.
===Super FX chip===
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The latest standalone version of [[Snes9x]], as well as [[RetroArch|Snes9x-Next]] allows for SFX overclocking, as well as and [[higan|bsnes-mercury]], though allows for SFX overclocking. Though in the latter the increase in CPU requirements can be noticeable.
==PC-Engine (TG-16)==
