Intel Pentium overdrive microprocessor

63 MHz
237-pin ceramic PGA

Overdrive processor for 80486 CPUs

83 MHz
237-pin ceramic PGA

Overdrive processor for 80486 CPUs

125 MHz
320-pin staggered ceramic PGA

Overdrive processor for Pentium 75

120/133 MHz
320-pin staggered ceramic PGA

Pentium overdrive 133 is the only overdrive processor that upgrades socket 4 Pentium processors. This overdrive CPU can replace both Pentium 60 and 66 CPUs. Depending on the bus frequency it will run either on 120 MHz or 133 MHz, so to get maximum performance out of this processor it is advisable before installation of the overdrive processor to change bus frequency of the upgraded system to 66 MHz.