Base 4

Base 4
Specifications
introduction	March 22, 1993
design type	PGA - ZIF
contacts	273
Bus protocol	Intel never introduced a term
Bus cycle	60 and 66  MHz
Operating voltage	5 V (60 MHz and Pentium OverDrive) 5.15 V (66 MHz)
Processors	Intel Pentium (60 and 66 MHz) Intel Pentium Overdrive (120 and 133 MHz)

The base 4 is a processor socket for receiving Pentium processors by chipmaker Intel .

The base 4 was the first base for Intel's Pentium series. It could be equipped with a 60 MHz or a 66 MHz Pentium processor. In January 1995, Intel also presented an upgrade CPU called Pentium Overdrive PODP5V133 , which could be operated at both 120 MHz and 133 MHz. At that time, Socket 4 had already been replaced by its successor, Socket 5 , which was introduced when the second Pentium generation was introduced with the internal Intel designation P54C. CPUs for socket 4 were never available from third-party manufacturers .