AMD Am486

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Production: since 90s
Producer: AMD
Processor clock: 25 MHz to 120 MHz
FSB cycle: 25 MHz to 50 MHz
L1 cache size: 8 kB to 16 kB
Instruction set : x86
Base: Base 3
View into an open AMD Am486DX2 with 66 MHz, the CPU core ( die ) is visible

The Am486 processor family is AMD's counterpart to the i486 processor family from Intel.

history

In the early 1990s, there were (still) far-reaching agreements between Intel and AMD for the exchange of technology. Therefore the 486 CPUs of both families initially differ only insignificantly. The microcode of the early AMD variants still corresponded to that of the Intel models, which is why 486 CPUs from Intel and AMD did not show any practical differences at that time.

However , AMD was not allowed to adopt the microcode of the Intel DX4 , which was modified due to technical changes to the CPU core and bus interface - often also called i486DX4 , although Intel never called it that - which is why the Am486DX4 was developed from the Am486DX2 on its own by AMD. The performance of the Am486DX4 initially lagged behind those of the DX4 from Intel, which was equipped with larger L1 caches , an improved multiplication unit and later also with an improved L2 cache controller.

AMD later developed the Am486DX4 into the Enhanced Am486DX4 and the Am5x86 . Both are fast 486 CPUs, with which AMD made up for some technical improvements that Intel had already made with the first Intel DX4 . For example, the Am5x86-PR75 with its core clock of 133 MHz was on par with a Pentium 75, as the name component “PR75” (the “PR” stands for Pentium Rating ) tries to suggest .

Model data Am486

Am486DX

Comparable to the Intel i486DX

Technical specifications

Am486DX-40
  • L1 cache: 8 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25, 33 or 40 MHz
  • Operating voltage (VCore): 5 V
  • Release DATE: 1993
  • Manufacturing technology: 0.7 µm
  • The size:? mm² at? Million transistors
  • Clock rates: 25, 33 and 40 MHz

Am486DE2

Am486DE2-66

CPU for embedded applications with clock doubling.

Technical specifications

  • L1 cache: 8 kB (write through)
  • Operating voltage: 3V VCore and 5V I / O
  • Manufacturing engineering: ?
  • Power management, two-pin system management interrupt (SMI)
  • Clock rates: 66 MHz
  • Package: 208-lead SQFP or 168-pin PGA

Am486SX

Corresponds to the Am486DX but without an integrated coprocessor. Comparable to the Intel i486SX

Technical specifications

  • L1 cache: 8 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25, 33 or 40 MHz
  • Operating voltage (VCore): 5 V
  • Publication date:
  • Manufacturing technology: 0.7 µm
  • The size:? mm² at? Million transistors
  • Clock rates: 33 and 40 MHz

Am486DX2

That of an AMD 80486DX2-80
Am486DX2-66, 0.5 µm version

Corresponds to the Am486DX , but with internal clock doubling. Comparable to the i486DX2

Technical specifications

  • L1 cache: 8 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25, 33 or 40 MHz
  • Operating voltage (VCore): 5 V (0.7 µm), later 3.3 V (0.5 µm)
  • Publication date:
  • Manufacturing technology: 0.7 µm, later 0.5 µm
  • The size:? mm² at? Million transistors
  • Clock rates: 50 MHz (0.7 µm version only), 66 and 80 MHz

Am486SX2

AMD Am486SX2-66

Corresponds to the Am486SX , but with internal clock doubling. Comparable to the Intel i486SX2

Technical specifications

  • L1 cache: 8 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25 or 33 MHz
  • Operating voltage (VCore): 5 V
  • Publication date:
  • Manufacturing technology: 0.7 µm
  • The size:? mm² at? Million transistors
  • Clock rates: 50 and 66 MHz

Am486DX4

The AMD 80486DX4-100
Am486DX4-100

Corresponds to the Am486DX , but with internal clock tripling . Comparable to the Intel DX4 , but only with 8 kB instead of 16 kB L1 cache.

Technical specifications

  • L1 cache: 8 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25, 33 or 40 MHz
  • Operating voltage (VCore): 3.3V
  • Publication date:
  • Manufacturing technology: 0.5 µm
  • The size:? mm² at? Million transistors
  • Clock rates: 75, 90 ( OEM ), 100 and 120 MHz

Model data Enhanced Am486

The Enhanced Am486 supports extended power-saving modes and the write-back method for the L1 cache. At first it was only available with 8 kB, later also with 16 kB L1 cache.

Enhanced Am486DX2

Enhanced Am486DX2-66 with 8 kB L1 cache

Improved variant of the Am486DX2 : initially 8, later also 16 kB write-back L1 cache

Technical specifications

  • L1 cache: 8 or 16 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25, 33 or 40 MHz
  • Operating voltage (VCore): 3.30 or 3.45 V.
  • Publication date:
  • Manufacturing technology: 0.50 µm (8 kB L1 cache); 0.35 µm (16 kB L1 cache)
  • The size:? mm² at? Million transistors
  • Clock rates:
    • 8 kB L1 cache: 66 and 80 MHz
    • 16 kB L1 cache: 66 MHz

Enhanced Am486DX4

Enhanced Am486DX4-120 with 8 kB L1 cache

Improved variant of the Am486DX4 : initially 8, later also 16 kB write-back L1 cache

Technical specifications

  • L1 cache: 8 or 16 kB
  • L2 cache: depending on the mainboard or chipset used
  • Socket 3 with an FSB of 25, 33 or 40 MHz
  • Operating voltage (VCore): 3.30 or 3.45 V.
  • Publication date:
  • Manufacturing technology: 0.50 µm (8 kB L1 cache); 0.35 µm (16 kB L1 cache)
  • The size:? mm² at? Million transistors
  • Clock rates:
    • 8 kB L1 cache: 75, 100 and 120 MHz
    • 16 kB L1 cache: 100 and 120 MHz

Am5x86 (X5)

Based on the Enhanced Am486DX4 with 16 kB L1 cache. Because of the high clock frequency, the internal clock quadrupling and for marketing reasons it was sold as a 5x86. See Am5x86 for technical details etc.

See also

Web links

Commons : AMD Am486  - collection of pictures, videos and audio files

Data Sheets