Intel Pentium II Processor

关于 Intel Pentium II

Pentium II 是桌面型电脑的中央处理器，除了内建 L2 Cache 以外，也支持双处理器架构（就是Pentium Pro MMX Edition）。英特尔也正式推广新的插卡式接口。

Pentium II Mobile 是给笔记本型电脑使用的，而后来推出的 Pentium II Xeon 则是用来取代Pentium Pro 的服务器微处理器（支持多处理器架构）。Pentium II Celeron 则是被简化的Pentium II，英特尔故意减低其 L2 Cache 的大小来达到减低其效能的目的，其目标市场则是低价电脑，不过初期的产品由于效能太差（完全没有L2 Cache）而导致被使用者诟病。英特尔于是就调整战略：将 Celeron 处理器的 L2 Cache 设定为只有 Pentium II 的一半(也就是 128 KB )，这样既有合理的效能，又有相对低廉的售价（有A字尾的）；这样的策略一直延续到今天。不过很快有人发现，使用双 Celeron 的系统与双 Pentium II 的系统差距不大，而价格却便宜很多，结果造成了 Celeron 冲击高端市场的局面。后来英特尔决定取消 Celeron 处理器的 SMP 功能，才解决了这个问题。

Intel Pentium II Celeron 300MHz A 是这里 Celeron 中唯一有 L2 Cache 的（128KB）。Pentium II Xeon ES Intel Confidential 虽然是工程版，可是因为 Pentium II Xoen 本身是给业界大厂使用，所以存世量还不少，虽然说现在贸然要找还是很不容易，但是拍卖市场价格并不高（因为大部分收藏家都有了）。

Introduction

The Pentium II is a sixth-generation x86 architecture microprocessor by Intel, introduced on May 7, 1997. It was based on a modifed version of the P6 core first used for the Pentium Pro, but with improved 16-bit performance and the addition of the MMX instructions which had already been introduced on the Pentium MMX.

Unlike previous Intel processors such as the Pentium and Pentium Pro, the Pentium II was packaged in a slot-based form-factor rather than a socket one. This larger package was a compromise allowing Intel to separate the secondary cache from the processor while still keeping it on a closely coupled bus. This separate cache was slower (running at half the processor speed) than that in the Pentium Pro, but solved the Pentium Pro’s low yields allowing Intel to introduce the Pentium II at a mainstream price level.

A low-end version of the Pentium II - essentially a Pentium II with less (or no) level 2 cache - was marketed under the name “Celeron”. The Pentium II Xeon was a high-end version intended for use on servers.

By early 1999, the Pentium III superseded the Pentium II.

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