I've been overclocking since about 85 or 86 (~18 years ago). Back then it was quite the "black art", and since just about no one owned a PC, no one knew anything about it. My first overclock was acheived finding the crystal on the motherboard that supplied the frequency (I think it was like 14.33 MHz) and the figuring out what I "thought" the PC would overclock to. Since 14.33MHz was about triple the 4.77MHz that the computer was running, I went by radio shack and bought a crystal that was right around 21MHz (they were out of stock for a while...weird). Anyway, the result was that I had already upgraded my Intel 8088 to an NEC V20 chip (more efficient at the same speed) and now I had that bad boy cranked up to 7 MHz!!!.
Many games back then were tied to the CPU clock, so at 7 MHz, a good percentage of my games were now too fast to play. Who could imagine a machine faster?!?!?
Joe