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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.
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]
| Model | FSB | Clock speed | VCore | L1-Cache | Introduced |
|---|---|---|---|---|---|
| Am486 DX-25 | 25 MHz | 25 MHz | 5 V | 8 KiB WT | |
| Am486 DX-33 | 33 MHz | 33 MHz | 5 V | 8 KiB WT | |
| Am486 DX-40 | 40 MHz | 40 MHz | 5 V | 8 KiB WT | Apr 1993 |
| Am486 SX-33 | 33 MHz | 33 MHz | 5 V | 8 KiB WT | |
| Am486 SX-40 | 40 MHz | 40 MHz | 5 V | 8 KiB WT | |
| Am486 DE2-66 | 33 MHz | 66 MHz | 3 V | 8 KiB WT | 1996(?) |
| Am486 DX2-50 | 25 MHz | 50 MHz | 5 V | 8 KiB WT | Apr 1993 |
| Am486 DX2-66 | 33 MHz | 66 MHz | 5/3.3 V | 8 KiB WT | Sep 1994[1] |
| Am486 DX2-80 | 40 MHz | 80 MHz | 5/3.3 V | 8 KiB WT | Sep 1994[1] |
| Am486 SX2-50 | 25 MHz | 50 MHz | 5 V | 8 KiB WT | |
| Am486 SX2-66 | 33 MHz | 66 MHz | 5 V | 8 KiB WT | Apr 1994[1] |
| Am486 DX4-75 | 25 MHz | 75 MHz | 3.3 V | 8 KiB WT | |
| Am486 DX4-100 | 33 MHz | 100 MHz | 3 V | 8 KiB WT | 1995 |
| Am486 DX4-120 | 40 MHz | 120 MHz | 3.3 V | 8 KiB WT | |
| Enhanced Am486 DX2-66 | 33 MHz | 66 MHz | 3.3/3.45 V | 8/16 KiB WB | |
| Enhanced Am486 DX2-80 | 40 MHz | 80 MHz | 3.3/3.45 V | 8 KiB WB | |
| Enhanced Am486 DX4-75 | 25 MHz | 75 MHz | 3.3/3.45 V | 8 KiB WB | |
| Enhanced Am486 DX4-100 | 33 MHz | 100 MHz | 3.3/3.45 V | 8/16 KiB WB | |
| Enhanced Am486 DX4-120 | 40 MHz | 120 MHz | 3.3/3.45 V | 8/16 KiB WB |
WT = Write-Through cache strategy, WB = Write-Back cache strategy
References[edit]
Amd & Ati Network & Wireless Cards Driver Download For Windows 10
- ^ abc'Am486/5x86'. CPU MUSEUM. Retrieved 2017-07-19.
External links[edit]
| Wikimedia Commons has media related to AMD Am486. |
- cpu-collection.de AMD Am486 processor images and descriptions
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