AMD 80486 Processor

关于 AMD 80486

AMD 80486 32 位处理器于 1993 年 5 月推出，即英特尔 486 上市四年后。这款 486 在当时带有革命性的 8 KB 一级缓存。此高速缓存允许将特定的重复命令和操作直接存储在 CPU 中。不再需要为此访问慢得多的 RAM。

第二个重要创新是 DX CPU 中集成的协处理器，它极大地加速了特殊的数学计算和复杂的图形表示。

使用 40 MHz 的处理器时钟，可以相对较快地达到普通主板的最大可能时钟频率。在那之前，系统总线的时钟类似于处理器时钟。但是，为了提高工作速度，AMD 开发了 DX2 和 DX4 处理器。DX2 的内部时钟速度是外部时钟的两倍，因此处理微指令的速度是外部速度的两倍。然而，与最初的外观相反，DX4 的内部时钟速度仅为 3 倍。

Introduction

The Am486 is a 80486-class processors 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. Early AMD 486 chips were drop-in replacements for their Intel counterparts, but later AMD clock-doubled 486s ran at 3.3 volts instead of Intel’s 5 volts, which limited their suitability as upgrade chips until third-party voltage adapters appeared on the market.

While the Am386 was primarily used by small computer manufacturers, the Am486DX, DX2, and SX2 chips gained acceptance among larger computer manufactuers, expecially 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 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 AMD Am5x86 was an enhanced Am486.

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AMD A80486DX2-66

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