A 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 8k of memory cache built into the processor with 32-bit databus architecture and was available in clock rates ranging from 20MHz to 33MHz. The 486 was available as either a DX or SX, the DX features a built-in coprocessor, the SX does not. In addition to the 486SX, a 486SX2 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 890486SX (codenamed P45 and P23) for $258.00 that ran at 16MHz, 20MHz, 25MHz, or 33MHz, a lower clock speeds than the DX.
- On March 2, 1992 the 486DX2 (codenamed P24 and P24S) was introduced and ran at double the clock rate of a 486. Thus, a DX2 on a system with a 33MHz bus would run at 66MHz. Alternatively referred to as the i486DX2.
- In 1994 the 486DX4 (codenamed P24C and P24CT) was introduced, it tripled the clock rate of the 486 and has doubled the cache (16k). If you had a 33MHz it would make it a 100MHz. Note: there is no 486SX4.