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一、评测的背景及目的 1997年3月底,Intel公司发布了基于MMX技术的多能奔腾处理器(MMX Pentium),时至今日,种种迹象表明,这款未满周岁的“新”片将有可能成为Intel的弃儿。在1997年11月的拉斯维加斯Comdex计算机展览会上,身着银灰色密封工作服的Intel芯片员工们在展台上围绕着Pentium Ⅱ手舞足蹈,此举似乎在向世人宣告:1998年Intel的宠物将是Pentium Ⅱ,而不是MMX Pentium。 Intel为何如此快地喜新厌旧?从二者在国内的产品发布时间表上看,MMX Pentium为1997年3月31日,而Pentium Ⅱ为5月8日,相隔不到一个半月;从芯片体系结构而言,MMXPentium与Pentium Ⅱ分别源于Pentium与Pentium Pro,而后两者的定位有明确的分工,一个为商用及家用台式机,一个为PC服务器;而且细说起来,MMX Pentium与Pentium Ⅱ还有一些共性,如均采用0.35μm工艺,均支持MMX多媒体指令集,都增加了高速缓存。既然本是同根生,相煎又何太急? Intel公司如此“无情”,确实有其技术上的原因:在Intel公司沿用多年的Socket 7插座上,数据只能在单64位总线上传送,在通常的66.6MHz总线频率下,峰值带宽约为533MB/s,该带宽在高档系统与服务器中仍显狭窄。因此,Intel为Pentium Pro和PⅡ增加了第二条64位总线,这条背侧总线与二级高速缓存独立交谈,使?
First, the background and purpose of evaluation In late March 1997, Intel Corporation announced MMX technology based on the Pentium processor (MMX Pentium), up to now, there are indications that this under the age of “new” film will have Intel may become an outcast. At the Comdex Computer Show in Las Vegas in November 1997, Intel chip workers in silver-gray, sealed overalls danced around the booth with a Pentium II, a move that seemed to be telling the world that Intel’s 1998 pet Will be Pentium II, not MMX Pentium. Intel is so excited about the new grateful? From the two in the domestic product release schedule, MMX Pentium for March 31, 1997, and Pentium Ⅱ for May 8, less than a month and a half; from the chip architecture and Say, MMXPentium and Pentium Ⅱ come from Pentium and Pentium Pro separately, and then the two have a clear division of labor, one for commercial and home desktops, one for the PC server; and elaborate, MMX Pentium and Pentium Ⅱ and some Common, such as 0.35μm process are used, all support MMX multimedia instruction set, have increased the cache. Since this is the same root cause, phase frying too urgent? Intel company so “merciless”, does have its technical reasons: Intel Corporation used for many years Socket 7 socket, the data can only be sent on a single 64-bit bus, At the usual 66.6MHz bus frequency, the peak bandwidth is about 533MB / s, which is still narrow in high-end systems and servers. As a result, Intel added a second 64-bit bus to the Pentium Pro and PII. This back-side bus talks independently of the L2 cache so that?