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by tenebrisalietum 886 days ago
SNES can go up to a whopping 3.58Mhz (NTSC clock, not sure if exactly the same for PAL) but I believe due to some bus/architecture weirdness slows down to 1.79Mhz (which is what the NTSC NES runs at) when reading the controllers.

Now the SuperFX chip, in Star Fox, ran at 10Mhz. Later versions like the one in Doom on SNES went up to 21Mhz.