What is Intel CPU?
I assume you mean an Intel Microprocessor.
Intel has made many different microprocessors, starting with the
4 bit Intel 4004 in 1971 followed by the 8 bit Intel 8008 in
1972.
The modern Intel Microprocessor used in PC is a 32 bit or 64 bit
Microprocessor whose architecture is derived from the 8 bit Intel
8008. Some of the other Intel Microprocessor in this path of
architectural evolution are the 8 bit Intel 8080, the 8 bit Intel
8085, the 16 bit Intel 8086 (and the 16 bit Intel 8088 with 8 bit
external multiplexed databus), the 16 bit Intel 80186, the 16 bit
Intel 80286, the 32 bit Intel 80386 (first 80x86 Microprocessor to
implement virtual memory), the 32 bit Intel 80489, the 32 bit Intel
Pentium (was originally to have been the 80586, but you cannot
Trademark numbers only words and Intel wanted a Trademark at that
time to protect their IP rights).
Intel also built many other Microprocessors with unrelated
architectures (e.g. 3000 series bitslice, 80432, 80860, 80960).