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486 Processors Chart

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This list is not comprehensive.

486
AMD Processors	Natural State	Sockets	L1 Cache	Transistors
Am486SX 33 July, 1993	168 pins 33MHz (33x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
Am486SX 33 October, 1993	168 pins 33MHz (33x1) 3.0v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
Am486SX 40 July, 1993	168 pins 40MHz (40x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
Am486SX2 50 February, 1994	168 pins 50MHz (25x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million 0.7µm process ?mm² die
Am486SX2 66 April, 1994	168 pins 66MHz (33x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million 0.7µm process ?mm² die
Am486DX 25 April, 1993	168 pins 25MHz (25x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.6 million ?µm process 89mm² die
Am486DX 33 April, 1993	168 pins 33MHz (33x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.6 million ?µm process 89mm² die
Am486DX 40 April, 1993	168 pins 40MHz (40x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.6 million ?µm process 89mm² die
Am486DX2 50 April, 1993	168 pins 50MHz (25x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	? million 0.7µm process ?mm² die
Am486DX2 66 November, 1994	168 pins 66MHz (33x2) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million 0.7µm process ?mm² die
Am486DX2 66 Enhanced WB	168 pins iP24D pinout 66MHz (33x2) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	? million ?µm process ?mm² die
Am486DX2 80 September, 1994	168 pins 80MHz (40x2) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million 0.5µm process ?mm² die
Am486DX4 75	168 pins 75MHz (25x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
Am486DX4 100 September, 1994	168 pins 100MHz (33x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million 0.5µm process ?mm² die
Am486DX4 120 June 5, 1995	168 pins 120MHz (40x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million 0.44µm process ?mm² die
Am486DX4 100 Enhanced WB	168 pins iP24D pinout 100MHz (33x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	? million ?µm process ?mm² die
Am5x86 133 (X5) December, 1995	168 pins iP24D pinout 133MHz (33x4) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	? million 0.35µm process 43mm² die
Cyrix Processors	Natural State	Sockets	L1 Cache	Transistors
Cx486DX 33 (M6) September, 1993	168 pins 33MHz (33x1) 3.3v or 5v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	1.1 million ?µm process 196mm² die
Cx486DX 40 (M6) September, 1993	168 pins 40MHz (40x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.1 million ?µm process 196mm² die
Cx486DX 50 (M6) September, 1993	168 pins 50MHz (50x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.1 million ?µm process 196mm² die
Cx486DX2 50 (M7)	168 pins 50MHz (25x2) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
Cx486DX2 66 (M7)	168 pins 66MHz (33x2) 3.3v or 5v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
Cx486DX2 80 (M7)	168 pins 80MHz (40x2) 3.3v or 5v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
Cx486DX4 75 (M7) September, 1995	168 pins 75MHz (25x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	1.1 million ?µm process ?mm² die
Cx486DX4 100 (M7) September, 1995	168 pins 100MHz (33x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	1.1 million ?µm process ?mm² die
Cx5x86 100 (M9, M1sc) 1995	168 pins iDX4WB pinout 100MHz (33x3) 100MHz (50x2) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	2.0 million 0.65µm process ?mm² die
Cx5x86 120 (M9, M1sc) October 30, 1995	168 pins iDX4WB pinout 120MHz (40x3) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	2.0 million 0.65µm process 144mm² die
IBM Processors	Natural State	Sockets	L1 Cache	Transistors
IBM486DX2 66	168 pins 66MHz (33x2) 3.3v or 3.6v or 5v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
IBM486DX2 80	168 pins 80MHz (40x2) 3.3v or 3.45v or 4.0v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
IBM486DX4 75	168 pins 75MHz (25x3) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
IBM486DX4 100	168 pins 100MHz (33x3) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
IBM486DX4WB 75	168 pins iP24D pinout 75MHz (25x3) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
IBM486DX4WB 100	168 pins iP24D pinout 100MHz (33x3) 3.45v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	8KB unified	? million ?µm process ?mm² die
IBM5x86C 75	168 pins iDX4WB pinout 75MHz (25x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	? million ?µm process ?mm² die
IBM5x86C 100	168 pins iDX4WB pinout 100MHz (33x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3	16KB unified	? million ?µm process ?mm² die
Intel Processors	Natural State	Sockets	L1 Cache	Transistors
i486SX 16 (P23) September 16, 1991	168 pins i486SX pinout 16MHz (16x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	1.185 million 1.0µm process ?mm² die
i486SX 20 (P23) September 16, 1991 - {$258}	168 pins i486SX pinout 20MHz (20x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	1.185 million 1.0µm process ?mm² die
i486SX 25 (P23) September 16, 1991	168 pins i486SX pinout 25MHz (25x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	1.185 million 1.0µm process ?mm² die
i486SX 33 (P23) September 21, 1992	168 pins i486SX pinout 33MHz (33x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	0.9 million 0.8µm process 67mm² die
i486SX2 50	168 pins i486SX pinout 50MHz (25x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	0.9 million 0.8µm process 67mm² die
i486SX2 66	168 pins i486SX pinout 66MHz (33x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	0.9 million 0.8µm process 67mm² die
i487SX 20 (NPX - P23N)	169 pins i487SX pinout 20MHz (20x1) 5v	Co-Processor	8KB unified	1.2 million ?µm process ?mm² die
i487SX 25 (NPX - P23N)	169 pins i487SX pinout 25MHz (25x1) 5v	Co-Processor	8KB unified	1.2 million ?µm process ?mm² die
i486SXODP 25	169 pins 25MHz (25x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486SXODP 33	169 pins 33MHz (33x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486SX2ODP-50	169 pins 50MHz (25x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DX 25 (P4) April 10, 1989 - {$900}	168 pins i486DX pinout 25MHz (25x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million 1.0µm process 165mm² die
i486DX 33 (P4) May 7, 1990	168 pins i486DX pinout 33MHz (33x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million 1.0µm process 165mm² die
i486DX 50 (P4) June 24, 1991	168 pins i486DX pinout 50MHz (50x1) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million 0.8µm process 81mm² die
i486DX2 50 (P24) March 3, 1992 - {$550}	168 pins i486DX pinout 50MHz (25x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million 0.8µm process 81mm² die
i486DX2 66 (P24) August 10, 1992	168 pins i486DX pinout 66MHz (33x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million 0.8µm process 81mm² die
i486DX2WB 50 (P24D) October, 1994	168 pins iP24D pinout 50MHz (25x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million ?µm process ?mm² die
i486DX2WB 66 (P24D) October, 1994	168 pins iP24D pinout 66MHz (33x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	1.2 million ?µm process ?mm² die
i486DX4 75 (P24C) March 7, 1994 - {$475}	168 pins i486DX4 pinout 75MHz (25x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3 Socket 6	16KB unified	1.6 million 0.6µm process 345mm² die
i486DX4 100 (P24C) March 7, 1994 - {$580}	168 pins i486DX4 pinout 100MHz (33x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3 Socket 6	16KB unified	1.6 million 0.6µm process 345mm² die
i486DX4WB 100 - embedded chip	168 pins iDX4WB pinout 100MHz (33x3) 3.3v	486 Socket¹ Socket 1¹ Socket 2¹ Socket 3 Socket 6	16KB unified	1.6 million ?µm process ?mm² die
i486DXODP 25 (P23T)	169 pins i487SX pinout 25MHz (25x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DXODP 33 (P23T)	169 pins i487SX pinout 33MHz (33x1) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DX2ODP 50 (P23T) June, 1993	169 pins i487SX pinout 50MHz (25x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DX2ODP 66 (P23T) June, 1993	169 pins i487SX pinout 66MHz (33x2) 5v	Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DX4ODP 75 (P23T) October, 1994	169 pins i487SX pinout 75MHz (25x3) 5v to 3.3v	Socket 1 Socket 2 Socket 3	16KB unified	? million ?µm process ?mm² die
i486DX4ODP 100 (P23T) October, 1994	169 pins i487SX pinout 100MHz (33x3) 5v to 3.3v	Socket 1 Socket 2 Socket 3	16KB unified	? million ?µm process ?mm² die
i486DX2ODPR 50 (P4T) June, 1993	168 pins i486DX pinout 50MHz (25x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DX2ODPR 66 (P4T) June, 1993	168 pins i486DX pinout 66MHz (33x2) 5v	486 Socket Socket 1 Socket 2 Socket 3	8KB unified	? million ?µm process ?mm² die
i486DX4ODPR 75 (P4T) October, 1994	168 pins i486DX pinout 75MHz (25x3) 5v to 3.3v	486 Socket Socket 1 Socket 2 Socket 3	16KB unified	? million ?µm process ?mm² die
i486DX4ODPR 100 (P4T) October, 1994	168 pins i486DX pinout 100MHz (33x3) 5v to 3.3v	486 Socket Socket 1 Socket 2 Socket 3	16KB unified	? million ?µm process ?mm² die
PODP5V 63 (P24T) February 3, 1995	235 pins P24T pinout 63MHz (25x2.5) 5v	Socket 2 Socket 3	16KB data 16KB instruction	? million 0.6µm process ?mm² die
PODP5V 83 (P24T) October, 1995	237 pins P24T pinout 83MHz (33x2.5) 5v	Socket 2 Socket 3	16KB data 16KB instruction	? million ?µm process ?mm² die

¹ Voltage regulator required.

486 Processor Adapters
Adapter Manufacturer	Natural State	Sockets
CCT 486 Adapter (AMD 486DX4, AMD 5x86)	168 pins AMD 486DX4: 100MHz (33x3.0) AMD 5x86: 133MHz (33x4.0)	486 Socket Socket 1 Socket 2 Socket 3
ComputerNerd RA4 Adapter (AMD 486DX, AMD 5x86, Cyrix 5x86, Intel 486DX)	168 pins AMD 486DX: 120MHz (40x3.0) 100MHz (33x3.0) 80MHz (40x2.0) AMD 5x86: 160MHz (40x4.0) 150MHz (50x3.0) 133MHz (33x4.0) Cyrix 5x86: 133MHz (33x4.0) 120MHz (40x3.0) 100MHz (50x2.0) 100MHz (33x3.0) Intel DX4: 100MHz (50x2.0) 100MHz (33x3.0) 5v to 3.45v	486 Socket Socket 1 Socket 2 Socket 3
Evergreen 586 (AMD 5x86-133)	168 pins 133MHz (33x4.0) 100MHz (25x4.0) 5v to 3.45v	Socket 1 Socket 2 Socket 3
Gainbery 5x86-133 (AMD 5x86-133)	168 pins 133MHz (33x4.0) 100MHz (25x4.0) 5v to 3.45v	486 Socket Socket 1 Socket 2 Socket 3
Kingston Turbochip-133 (AMD 5x86-133)	168 pins 133MHz (33x4.0) 100MHz (25x4.0) 5v to 3.45v	486 Socket Socket 1 Socket 2 Socket 3
Madex 486004 (AMD 486DX4, AMD 5x86, Intel 486DX4)	168 pins 133MHz (33x4.0) 120MHz (30x4.0) 100MHz (33x3.0) 100MHz (25x4.0) 75MHz (25x3.0) 5v to 3v 5v to 3.3v 5v to 3.45v 5v to 4v	Socket 1 Socket 2 Socket 3
PNY Quickchip-133 (AMD 5x86-133)	168 pins 133MHz (33x4.0) 100MHz (25x4.0) 5v to 3.45v	486 Socket Socket 1 Socket 2 Socket 3
PowerLeap PL/586-133 (AMD 5x86-133)	168 pins 133MHz (33x4.0) 100MHz (25x4.0) 5v to 3.45v	486 Socket Socket 1 Socket 2 Socket 3
Trinity Works P5x-133 (AMD 5x86-133)	169 pins 133MHz (33x4.0) 100MHz (25x4.0) 80MHz (20x4.0) 64MHz (16x4.0) 5v to 3.45v	486 Socket Socket 1 Socket 2 Socket 3

Notes:

Many processors are not listed here. Most notably missing are the low power versions of chips listed as well as the 208-pin QFP (Quad Flat Pack) processors which are surface mounted.

The dates listed are official introduction dates. It does not necessarily mean those processors were available in quantity on that date.

The 486-class AMD 5x86 is a 4.0x multiplier (33x4.0=133), but the motherboard should be set to a 2.0x multiplier. The processor will interpret the 2.0x multiplier as 4.0x, and run at its correct speed. The chip works best with a motherboard that supports write-back cache mode (supports a P24D processor). Otherwise, the write-back mode would have to be disabled by a voltage adapter in order to function reliably.

The P24D is the write-back enhanced version of the P24 (i486DX2).

The PODP5V 63 and 83 processors can only fit in the larger sockets (2 and 3). Both provide a 2.5x multiplier and have built-in voltage regulation.

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Last Updated: July/14/2008