The Intel 486 ("four-eighty-six"), also known as the i486 or 80486 was a higher performance follow-up to the Intel 80386 microprocessor. The 486 was introduced in 1989 and was the first tightly pipelined x86 design as well as the first x86 chip to use more than a million transistors, due to a large on-chip cache and an integrated floating-point unit. It represents a fourth generation of binary compatible CPUs since the original 8086 of 1978.