AMD 5x86 P75 (Enhanced 486 DX5) Processor

关于 AMD 5x86 P75 (增强型 486 DX5)

AMD 5x86 处理器于 1995 年 11 月 6 日推出。这些与增强型 Am486DX4 处理器基于相同的微架构，使用 0.35 µm 工艺制造，并具有 16 KB L1 缓存。在 5x86 上，AMD 第一次使用了所谓的 P 等级，这表明相对于对应的 Intel Pentium 的性能。5x86-P75 CPU 的性能应该可以与 Intel Pentium 75 相媲美。与 Pentium 75 相比，5x86 的主板仍然使用 Socket 3 接口，因此这些处理器为 486 系统提供了廉价的升级选项，因为 486 主板可以继续使用。

关键数据：

• 1,200,000 个晶体管
• 0.35 µm CMOS 制造技术
• 32 位 CPU（数据和地址总线各 32 位）
• MMU（内存管理单元）
• 16 KB 回写式 L1 高速缓存
• FPU 和四倍内部时钟
• 使用 P 或 PR 等级（性能相对到 Intel Pentium）
• 支持高达 4 GB 的内存

Introduction

Introduced in November 1995, the AMD 5x86 is a standard 486 processor with an internally-set multiplier of 4, allowing it to run at 133 MHz on systems without official support for clock-multiplied DX2 or DX4 486 processors. Like most of the later 486 parts, the 5x86 featured write-back L1 cache, and unlike all but a few, a generous 16 kilobytes rather than the more common 8KB.

Since having a clock multiplier of four was not part of the original Socket 3 design, AMD made the 5x86 look for a two times setting from the motherboard and interpret that as four times instead. In other words, to use the 5x86 you want to set the motherboard to the 2x setting. This will actually cause the 5x86 to run at 4x.

The combination of best-in-class clock speed and the write-back cache allowed the 5x86 to equal or slightly surpass an Intel Pentium 75 MHz processor in business application performance. Also, because it was based on a pure 486 design, it was compatible with older systems, something its slightly faster rival, the Cyrix 5x86, had trouble with.

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AMD Am5x86-P75 AMD-X5-133ADZ