The Intel 4040 microprocessor was the successor to the Intel 4004, introduced in 1974. The 4040 employed a 10 μm silicon gate enhancement-load PMOS technology, was made up of 3,000 transistors and could execute approximately 62,000 instructions per second.

The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971. Sold for US$60, it was the first commercially produced microprocessor, and the first in a long line of Intel CPUs.