What (who) is Intel 80486 - definition
![first 486 system from the UK]] on the cover of BYTE, September 1989](https://commons.wikimedia.org/wiki/Special:FilePath/Byte magazine September 1989 cover.png?width=200 "first 486 system from the UK]] on the cover of BYTE, September 1989")
![[[UMC Green CPU]] U5SX](https://commons.wikimedia.org/wiki/Special:FilePath/KL UMC U5SX.jpg?width=200 "[[UMC Green CPU]] U5SX")
Wikipedia
The Intel 486, officially named i486 and also known as 80486, is a microprocessor. It is a higher-performance follow-up to the Intel 386. The i486 was introduced in 1989. It represents the fourth generation of binary compatible CPUs following the 8086 of 1978, the Intel 80286 of 1982, and 1985's i386.
It was the first tightly-pipelined x86 design as well as the first x86 chip to include more than one million transistors. It offered a large on-chip cache and an integrated floating-point unit.
A typical 50 MHz i486 executes around 40 million instructions per second (MIPS), reaching 50 MIPS peak performance. It is approximately twice as fast as the i386 or i286 per clock cycle. The i486's improved performance is thanks to its five-stage pipeline with all stages bound to a single cycle. The enhanced FPU unit on the chip was significantly faster than the i387 FPU per cycle. The intel 80387 FPU ("i387") was a separate, optional math coprocessor that was installed in a motherboard socket alongside the i386.
The i486 was succeeded by the original Pentium.
