I think it's time to pull out my old Sega Genesis... if I still have it some where... and play some Altered Beast, albeit with an overclocked processor .  I don't know what you could gain by overclocking your game system where the games are already tuned to run fine on it - but I guess it's not a question of why, more a question of why not?

Link from Slashdot

Overclock Your Old Game System