Intel 80486

80386 ◄ 80486 ► Pentium


Intel 80486 © Intel
Intel 80486 © Intel

The Intel 80486 is a higher performance follow-up to the Intel 80386 microprocessor. Introduced in 1989, it is 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.

A 50 MHz 80486 executes around 40 million instructions per second on average and is able to reach 50 MIPS peak performance.

The i486 does not have the usual 80-prefix because of a court ruling that prohibits trademarking numbers (such as 80486). Later, with the introduction of the Pentium brand, Intel began branding its chips with words rather than numbers.

 

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Intel i486 DX

Intel 80486 DX-25

A80486DX-25
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Intel 80486 DX-33

A80486DX-33
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Intel 80486 DX-50

A80486DX-50
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Intel i486 SX

An i486DX with the FPU part disabled or missing. Early variants were parts with disabled (defective) FPUs. Later versions had the FPU removed from the die to reduce area and hence cost.

Intel 80486 SX-16

A80486SX-16
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Intel 80486 SX-25

Intel A80486SX-25 (the exact CPU!!) Die Picture by Pauli Rautakorpi - Published under the Creative Commons Attribution 3.0 Unported license. Slightly edited by HARDWARECOP.

A80486SX-25
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Intel 80486 SX-33

A80486SX-33
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Intel i486 DX2

The internal processor clock runs at twice the clock rate of the external bus clock.

Intel 80486 DX2-50

A80486DX2-50
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Intel 80486 DX2-66

Intel i486 DX2-66 SX750 Die Picture by Pauli Rautakorpi - Published under the Creative Commons Attribution 3.0 Unported license. Slightly edited by HARDWARECOP.

A80486DX2-66
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Intel 80486 DX2-66 (03H4939) by IBM

486DX2-66 03H4939
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Intel i486 SX2

The i486 SX2 is an i486 SX with doubled internal frequency.

Intel 80486 SX2-50

Intel 80486 DX2-50 (the exact CPU!!) Die Picture by Pauli Rautakorpi - Published under the Creative Commons Attribution 3.0 Unported license. Slightly edited by HARDWARECOP.

A80486SX2-50
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Intel i486 DX4

Designed to run at triple clock rate (not quadruple as often believed; the DX3, which was meant to run at 2.5x the clock speed, was never released). DX4 models that featured write-back cache were identified by an "&EW" laser etched into their top surface, while the write-through models were identified by "&E".

Intel 80486 DX4-75

A80486DX4-75
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Intel 80486 DX4-100

Intel A80486DX4-100 Die Picture by Pauli Rautakorpi - Published under the Creative Commons Attribution 3.0 Unported license. Slightly edited by HARDWARECOP.

A80486DX4-100
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Unlisted models:

 

  • i486 SX: 20 MHz
  • i486 DX2: 40 MHz
  • i486 SX2: 66 MHz
  • i487 SX

 

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