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486 class ICs
486 information

The 486 is very similar to its predecessor, the 386. Main differences are an optimised instruction set, an on-chip unified instruction and data cache, an optional on-chip floating-point unit (FPU), and an enhanced bus interface unit. These improvements yield a rough doubling in performance over an 386 at the same clock rate.

There are several suffixes and variants including:
  • 486SX - 486 with its FPU disabled
  • 486DX - 486 with a working FPU
  • 486DX-2 - runs at twice the external clock rate
  • 486SL - 486DX with power conservation circuitry
  • 486SL-NM - 486SX with power conservation circuitry
  • 487 - 486DX with slightly different pinout for use in 486SX systems as FPU
  • OverDrive - 486DX-2 with slightly different pinout for use in 486SX systems
  • RapidCAD - 486DX in a special package with a companion FPU dummy package for use in 386 systems
  • 486DLC - mix version by some manufacturers, featuring a 486 instruction set and a 386-compatible pinout
The 486 processor has been licensed or reverse engineered by other companies such as IBM, AMD and Cyrix. Some manufacturers made hybrid 386/486 CPUs (Cxrix Cx486DLC, Texas Instruments TX486DLC), having a 486 instruction set and a 386-compatible pinout.

For more Information on x86 processors please refer to the x86 processor FAQ or CPU+Mainboard FAQ (german).
  add/correct 486 info  
118 486 chips in collection: show thumbnails
 AMD
  486 DX
   A80486DX-40 w/o Windows Logo
   A80486DX-40
   A80486DX2-50
   A80486DX2-66
   A80486DX2-66, variant
   A80486DXL2-66
   A80486DX2-66NV8T
   Am486DE2-66V8TGC
   A80486DX2-66SV8B
   Am486DX2-66V16BGC
   A80486DX2-80 V8T
   A80486DX2-80NV8T
   A80486DX4-90NV8T
   A80486DX4-100NV8T
   A80486DX4-100SV8B
   Am486DX4-100V16BGC
   Am486DX4-100SV16BGI
   A80486DX4-120NV8T
   A80486DX4-120SV8B
  5x86
   Am5x86-P75
   Am5x86-P75 X5-133ADW
   Am5x86-P75 X5-133ADZ
   Am5x86-P75 X5-133SFZ
   Am5x86-P75 DX5-133V16BHC
   Am5x86-P75 DX5-133W16BGC
   Am5x86-P75+ X5-150ADW
 Cyrix
  Cx486 DLC
   Cx486DLC-33GP black
   Cx486DLC-33GP
   Cx486DLC-33GP OEM
   Cx486DLC-33GP OEM
   Cx486DLC-40GP
  Cx486 SLC
   Cx486SLC/e-V25MP
   Cx486SLC/e-33MP
  Cx486 DRx
   Cx486DRx²25/50GP
   Cx486DRx²33/66GP
  Cx486 DX
   Cx486DX-33GP
   Cx486DX-V33QP
   Cx486DX-40GP
   Cx486DX-40 w/ Cooler, old Logo
   Cx486DX-40 w/ Cooler, newer Logo
   Cx486DX-40 w/ Cooler, new Logo
   Cx486DX2-50GP
   Cx486DX2-50 w/ Cooler
   Cx486DX2-50 w/ Cooler, 'Write-Back'
   Cx486DX2-66GP
   Cx486DX2-66GP ("Cooling Fan Required")
   Cx486DX2-V66GP
   Cx486DX2-V66GP 3.45V
   Cx486DX2-66 w/ Cooler
   Cx486DX2-V80GP 4.0V
   Cx486DX2-V80GP 3.45V
   Cx486DX2-80 w/ Cooler
   Cx486DX4-100GP
   Cx486DX4-100GP4
  Cx486 S
   Cx486S-33GP
   Cx486S-40 w/ Cooler
   Cx486S-40GP
 IBM
  486
   486-2V266GB relabeled
   486-V266GA
   486-V580GA
 Intel
  i486 DX
   A80486DX-25
   A80486DX-33
   A80486DX-33, DX Logo
   A80486DX-33, DX Logo (SL enhanced)
   A80486DX-50
   SB80486DX2-40
   SB80486DX2-50
   A80486DX2-50
   486DX2-50 (IBM)
   A80486DX2-66
   A80486DX2-66 (write-back cache)
   A80486DX2-66 w/ Cooler
   A80486DX2-66 OEM
   A80486DX4-75
   FC80486DX4-75 Mobile
   FC80486DX4-75 Mobile Module
   A80486DX4-100
   FC80486DX4-100 Mobile Module
   RapidCAD-1
   RapidCAD-2
  i486 SX
   A80486SX-20
   A80486SX-25
   A80486SX-25, Ceramic Lid
   KU80486SX-25
   A80486SX-33
   SB80486SX-33
   A80486SX2-50
   486SX2-50/SA OEM
  i486 SL
   KU80486SL-25
  i486 OverDrive
   OverDrive ODP486SX-25
   OverDrive ODPR486DX-25
   OverDrive ODPR486DX-25 (V3.0)
   OverDrive ODPR486DX-33
   OverDrive ODPR486DX-33 w/o Cooler
   OverDrive ODPR486DX-33 (V3.0)
   OverDrive DX2ODP50
   OverDrive DX2ODP66 (V4.0)
   OverDrive DX2ODPR66 (V3.0)
   OverDrive DX2ODPR66 (V4.0)
   OverDrive DX4ODP75
   OverDrive DX4ODPR75 (V1.1)
   OverDrive DX4ODPR100 (V1.0)
   OverDrive DX4ODPR100 (V1.1)
 SGS-Thomson
  486 DX
   ST486 DX-40
   ST486 DX2-50
   ST486 DX2-66
   ST486 DX2-66GS
   ST486 DX2-66GS, Variant
   ST486 DX2-80
   ST486 DX2-80GS
   ST486 DX4V100
   ST486 DX4-100
 Texas Instruments
  486
   TX486DLC-33GA
   TX486DLC-40BGA
   TX486DLC/E-40GA
   TI486DX2-G80-GA ("Windows Compatible")
 UMC
  U5S 486
   U5S-SUPER25
   U5SX 486-A