Intel introduced Pentium Overdrive processor as an upgrade option for older 486-class computers.
Pentium Overdrive has the capability to enhance the 486 machines performance without having to pay the price for a full Pentium chip. Installing an Overdrive chip is simply a matter of replacing the existing CPU with the Overdrive CPU.
It was designed to run at approximately two and a half times the motherboard's bus speed. Yet it had 2 major trade offs. First, Overdrives were only 32-bit processors, whereas Pentiums were completely 64-bit. Second, the Overdrive ran just as hot as a conventional Pentium, needing proper system ventilation to withstand the additional heat.
