INTEL PENTIUM II

Initially the Pentium II 233MHz was released in 1997 and introduced a new physical architecture which encased a circuit board within a plastic case. With this new technology, this allowed the chip to be easily added and removed. However, previous owners of Pentium motherboard could not upgrade to this new type of chip unless the motherboard they had included a SLOT 1 technology. The Pentium II runs from 233MHz to 450MHz.