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AMD Am486DX 40 MHz
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AMD Enhanced Am486 DX4-120 die shot

The Am486 is a 80486-class family of computerprocessors that was produced by AMD in the 1990s. Intel beat AMD to market by nearly four years, but AMD priced its 40 MHz 486 at or below Intel's price for a 33 MHz chip, offering about 20% better performance for the same price.

While competing 486 chips, such as those from Cyrix, benchmarked lower than the equivalent Intel chip, AMD's 486 matched Intel's performance on a clock-for-clock basis.

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While the Am386 was primarily used by small computer manufacturers, the Am486DX, DX2, and SX2 chips gained acceptance among larger computer manufacturers, especially Acer and Compaq, in the 1994 time frame.

AMD's higher clocked 486 chips provided superior performance to many of the early Pentium chips, especially the 60 and 66 MHz launch products. While equivalent Intel 80486DX4 chips were priced high and required a minor socket modification, AMD priced low. Intel's DX4 chips initially had twice the cache of the AMD chips, giving them a slight performance edge, but AMD's DX4-100 usually cost less than Intel's DX2-66.

The enhanced Am486 series supported new features like extended power-saving modes and an 8 KiBWrite-BackL1-Cache, later versions even got an upgrade to 16 KiB Write-Back L1-Cache.

The 133 MHz AMD Am5x86 was a higher clocked enhanced Am486.

Features[edit]

Am486 models[edit]

Am486SX2-66.
Am486DE2-66 with power management for embedded systems.
ModelFSBClock speedVCoreL1-CacheIntroduced
Am486 DX-2525 MHz25 MHz5 V8 KiB WT
Am486 DX-3333 MHz33 MHz5 V8 KiB WT
Am486 DX-4040 MHz40 MHz5 V8 KiB WTApr 1993
Am486 SX-3333 MHz33 MHz5 V8 KiB WT
Am486 SX-4040 MHz40 MHz5 V8 KiB WT
Am486 DE2-6633 MHz66 MHz3 V8 KiB WT1996(?)
Am486 DX2-5025 MHz50 MHz5 V8 KiB WTApr 1993
Am486 DX2-6633 MHz66 MHz5/3.3 V8 KiB WTSep 1994[1]
Am486 DX2-8040 MHz80 MHz5/3.3 V8 KiB WTSep 1994[1]
Am486 SX2-5025 MHz50 MHz5 V8 KiB WT
Am486 SX2-6633 MHz66 MHz5 V8 KiB WTApr 1994[1]
Am486 DX4-7525 MHz75 MHz3.3 V8 KiB WT
Am486 DX4-10033 MHz100 MHz3 V8 KiB WT1995
Am486 DX4-12040 MHz120 MHz3.3 V8 KiB WT
Enhanced Am486 DX2-6633 MHz66 MHz3.3/3.45 V8/16 KiB WB
Enhanced Am486 DX2-8040 MHz80 MHz3.3/3.45 V8 KiB WB
Enhanced Am486 DX4-7525 MHz75 MHz3.3/3.45 V8 KiB WB
Enhanced Am486 DX4-10033 MHz100 MHz3.3/3.45 V8/16 KiB WB
Enhanced Am486 DX4-12040 MHz120 MHz3.3/3.45 V8/16 KiB WB

WT = Write-Through cache strategy, WB = Write-Back cache strategy

References[edit]

  1. ^ abc'Am486/5x86'. CPU MUSEUM. Retrieved 2017-07-19.

External links[edit]

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  • cpu-collection.de AMD Am486 processor images and descriptions

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