80486/5x86 Die Photography

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.

AMD Am486 & Am5x86


A80486DX2-80 V8T



AMD-X5-133ADW (5x86-P75)

Cyrix Cx486DLC/SLC, Cx486 & Cx5x86

CPUs based on the Cyrix 486 design.


Texas Instruments TX486SLCE-V25PAF

Texas Instruments TX486DLC/E-40GA


Cyrix Cx486S-33GP FasCache



ST486 DX2-66


Intel i486

A80486SX-33 SX798 (P23)

A80486DX2-66 SX750 (P24)

A80486DX2-66 &E5V1X SX955 (P24D)

A80486SX2-50 &E5V1X SX845 (P23?)

A80486DX4-100 &E SX900 (P24C)

A80486DX4-100 &EW SK096 (P24C)

UMC U5 "GreenCPU"


All die pictures were taken by Pauli Rautakorpi and are published under the Creative Commons Attribution 3.0 Unported license. Slightly edited by HARDWARECOP (exposure adjustments).


*Please note that pre-released die photos might have a less good quality compared to an officially released die photo.