Updated: 05/21/2018 by Computer Hope

Intel 80486 processorA computer processor developed by Intel as an upgrade to the 386 processor series and commonly referred to as the 486 or i486. The 80486 has 8 k of memory cache built into the processor with 32-bit data bus architecture and was available in clock rates ranging from 20 MHz to 33 MHz. The 486 was available as either a DX or SX, the DX features a built-in coprocessor, the SX does not. A 486 SX2 was also available and was capable of doubling the speed. The picture is an example of the Intel i486 SX processor with the OverDrive socket.

  • In 1990, the 486SL was introduced and utilized less power than the 486 and is mainly used in portable computers.
  • On April 1991, Intel released the 890486 SX (code-named P45 and P23) for $258.00 that ran at 16 MHz, 20 MHz, 25 MHz, or 33 MHz, a lower clock speeds than the DX.
  • On March 2, 1992, the 486 DX2 (code-named P24 and P24S) was introduced and ran at double the clock rate of a 486. Thus, a DX2 on a system with a 33 MHz bus would run at 66 MHz. Alternatively referred to as the i486 DX2.
  • In 1994, the 486 DX4 (code-named P24C and P24CT) was introduced, it tripled the clock rate of the 486 and has doubled the cache (16k). If you had a 33 MHz, it would make it a 100 MHz. Note: there is no 486 SX4.

CPU terms, JTAG, Socket 1, Socket 2, Socket 3