Intel 80486

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.

Switch to the die picture page!

Intel i486 DX

Intel 80486 DX-25

A80486DX-25
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX-25
Introduction	04/10/1989
Manufacturing Date	12th week of 1990
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P4
Manufacturing process	800 nm
Transistors	1200000
Frequency	25 MHz
Bus Speed	25 MHz
Multiplier	x1
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	3 Watt
Vcore	5 Volt

Intel 80486 DX-33

A80486DX-33
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX-33
Introduction	05/07/90
Manufacturing Date	33rd week of 1992
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P4
Manufacturing process	1000 nm
Transistors	1200000
Instruction set	CISC
Frequency	33 MHz
Bus Speed	33 MHz
Multiplier	x1
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	3 Watt
Vcore	5 Volt

Intel 80486 DX-50

A80486DX-50
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX-50
Introduction	07/24/91
Manufacturing Date	14th week of 1992
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P4
Manufacturing process	1000 nm
Transistors	1200000
Instruction set	CISC
Frequency	50 MHz
Bus Speed	50 MHz
Multiplier	x1
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	4 Watt
Vcore	5 Volt

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
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486SX-16
Introduction	09/16/1991
Manufacturing Date	11th week of 1992
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P23
Manufacturing process	1000 nm
Transistors	1185000 (?)
Frequency	16 MHz
Bus Speed	16 MHz
Multiplier	x1
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	None / 80487 capable
Power consumption	2 Watt
Vcore	5 Volt

Intel 80486 SX-25

CPU die picture:

A80486SX-25
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486SX-25
Introduction	09/16/91
Manufacturing Date	10th week of 1993
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P23
Manufacturing process	1000 nm
Transistors	1185000
Instruction set	CISC
Frequency	25 MHz
Bus Speed	25 MHz
Multiplier	x1
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	None / 80487 SX capable
Power consumption	2 Watt
Vcore	5 Volt

Intel 80486 SX-33

Intel A80486 SX-33 SX931 different printing

A80486SX-33
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486SX-33
Introduction	09/21/92
Manufacturing Date	18th week of 1994
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P23
Manufacturing process	1000 nm
Transistors	1185000
Instruction set	CISC
Frequency	33 MHz
Bus Speed	33 MHz
Multiplier	x1
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	None / 80487 SX capable
Power consumption	2 Watt
Vcore	5 Volt

Intel i486 DX2

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

Intel 80486 DX2-50

A80486DX2-50
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX2-50
Introduction	03/03/92
Manufacturing Date	23rd week of 1993
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P24
Manufacturing process	800 nm
Transistors	1200000
Instruction set	CISC
Frequency	50 MHz
Bus Speed	25 MHz
Multiplier	x2
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	4 Watt
Vcore	5 Volt

Intel 80486 DX2-66

Intel A80486 DX2-66 SX759 w/ retail heatsink

CPU die picture:

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
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX2-66
Introduction	08/10/92
Manufacturing Date	44th week of 1994
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P24
Manufacturing process	800 nm
Transistors	1200000
Instruction set	CISC
Frequency	66 MHz
Bus Speed	33 MHz
Multiplier	x2
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	4 Watt
Vcore	5 Volt

Intel 80486 DX2-66 (03H4939) by IBM

486DX2-66 03H4939
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX2-66
Introduction	08/10/92
Manufacturing Date	14th week of 1993
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P24
Manufacturing process	800 nm
Transistors	1200000
Instruction set	CISC
Frequency	66 MHz
Bus Speed	33 MHz
Multiplier	x2
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	4 Watt
Vcore	5 Volt

Intel i486 SX2

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

Intel 80486 SX2-50

CPU die picture:

A80486SX2-50
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486SX2-50
Introduction	?
Manufacturing Date	21st week of 1994
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P23
Manufacturing process	?
Transistors	900000
Instruction set	CISC
Frequency	50 MHz
Bus Speed	25 MHz
Multiplier	x2
L1 Cache	8 KB
Data width	32 Bit
Floating Point Unit (FPU)	None / 80487 SX capable
Power consumption	3 Watt
Vcore	5 Volt

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
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX4-75
Introduction	03/07/1994
Manufacturing Date	21st week of 1994
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5 mm
Microarchitecture	80486
Codename	P24C
Manufacturing process	600 mn
Transistors	1600000
Frequency	75 MHz
Bus Speed	25 MHz
Multiplier	x3
L1 Cache	16 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	3 Watt
Vcore	3.3 Volt

Intel 80486 DX4-100

&E die picture:

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

&EW die picture:

A80486DX4-100
Specification Details

Show

Type	Central processing unit / CPU
Family	Intel 80486
CPU part number	A80486DX4-100
Introduction	03/07/1994
Manufacturing Date	43rd week of 1995
Package	168-pin CPGA
Socket	Socket 2/3
Dimensions	44,5 mm x 44,5
Microarchitecture	80486
Codename	P24C
Manufacturing process	600 nm
Transistors	1600000
Instruction set	CISC
Frequency	100 MHz
Bus Speed	33 MHz
Multiplier	x3
L1 Cache	16 KB
Data width	32 Bit
Floating Point Unit (FPU)	Integrated
Power consumption	4 Watt
Vcore	3 Volt

Further reading: Click here to see microcontrollers for 486s!

Unlisted models:

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

Sumbit a picture or contribute to the museum!

RETURN TO INTEL

RETURN TO THE MAIN MUSEUM PAGE