1771-CAPR现货

IA-64微处理器最大的缺陷是它们缺乏与x86的兼容，而Intel为了IA-64处理器能够更好地运行两个朝代的软件，它在IA-64处理器上（Itanium、Itanium2 ……）引入了x86-to-IA-64的解码器，这样就能够把x86指令翻译为IA-64指令。这个解码器并不是最有效率的解码器，也不是运行x86代码的最好途径（最好的途径是直接在x86处理器上运行x86代码），因此Itanium 和Itanium2在运行x86应用程序时候的性能非常糟糕。这也成为X86-64产生的根本原因。

处理技术

在解释超流水线与超标量前，先了解流水线（Pipeline）。流水线是Intel首次在486芯片中开始使用的。流水线的工作方式就象工业生产上的装配流水线。在CPU中由5－6个不同功能的电路单元组成一条指令处理流水线，然后将一条X86指令分成5－6步后再由这些电路单元分别执行，这样就能实现在一个CPU时钟周期完成一条指令，因此提高CPU的运算速度。经典奔腾每条整数流水线都分为四级流水，即指令预取、译码、执行、写回结果，浮点流水又分为八级流水。超标量是通过内置多条流水线来同时执行多个处理器，其实质是以空间换取时间。而超流水线是通过细化流水、提高主频，使得在一个机器周期内完成一个甚至多个操作，其实质是以空间换取时间。例如Pentium 4的流水线就长达20级。将流水线设计的步（级）越长，其完成一条指令的速度越快，因此才能适应工作主频更高的CPU。但是流水线过长也带来了一定副作用，很可能会出现主频较高的CPU实际运算速度较低的现象，Intel的奔腾4就出现了这种情况，虽然它的主频可以高达1.4G以上，但其运算性能却远远比不上AMD 1.2G的速龙甚至奔腾III-s。

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140GH3C3C60 140G-H3C3-C60

140GH3C3C63 140G-H3C3-C63

140GH3C3C70 140G-H3C3-C70

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140GH3C4C16 140G-H3C4-C16

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140GH3F3C90 140G-H3F3-C90

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140GH3F3D11 140G-H3F3-D11

140GH3F3D12 140G-H3F3-D12

140GH3F3D12KA 140G-H3F3-D12-KA

140GH3F3D16 140G-H3F3-D16

140GH3F4D10 140G-H3F4-D10

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140GH6C3C20 140G-H6C3-C20

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140GH6C3C25 140G-H6C3-C25

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140GH6C3C63 140G-H6C3-C63

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140GH6C4C15 140G-H6C4-C15

140GH6C4C16 140G-H6C4-C16

140GH6C4C20 140G-H6C4-C20

140GH6C4C25 140G-H6C4-C25

140GH6C4C30 140G-H6C4-C30

140GH6C4C32 140G-H6C4-C32

140GH6C4C35 140G-H6C4-C35

140GH6C4C40 140G-H6C4-C40

140GH6C4C63 140G-H6C4-C63

140GH6F3C80 140G-H6F3-C80

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140GH6F3C80UA 140G-H6F3-C80-UA

140GH6F3C90 140G-H6F3-C90

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140GH6F3D10 140G-H6F3-D10

140GH6F3D10AA 140G-H6F3-D10-AA

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140GH6F3D10KA 140G-H6F3-D10-KA

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140GH6F3D10SAKA 140G-H6F3-D10-SA-KA

140GH6F3D11 140G-H6F3-D11

140GH6F3D12 140G-H6F3-D12

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140GH6F3D16 140G-H6F3-D16

140GH6F4C80 140G-H6F4-C80

140GH6F4D10SAKA 140G-H6F4-D10-SA-KA

140GH6F4D16 140G-H6F4-D16

140GH6H3C25 140G-H6H3-C25

140GH6H3C60 140G-H6H3-C60

140GH6H3D10 140G-H6H3-D10

140GH6H3D12 140G-H6H3-D12

140GH6H3D16 140G-H6H3-D16

140GH6H4C25 140G-H6H4-C25

140GH6H4D10 140G-H6H4-D10

140GH6H4D16 140G-H6H4-D16

140GH6I3C25 140G-H6I3-C25

140GH6I3D10 140G-H6I3-D10

140GH6I3D16 140G-H6I3-D16

140GH6I4C25 140G-H6I4-C25

140GH6I4D16 140G-H6I4-D16

140GH6S3D12 140G-H6S3-D12

140GH6S4D12 140G-H6S4-D12

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140GH6X4 140G-H6X4

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140GHTC3C60 140G-HTC3-C60

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140GHTF4D12 140G-HTF4-D12

140GHTH3C60 140G-HTH3-C60

140GHTH3D10 140G-HTH3-D10

140GHTH3D12 140G-HTH3-D12

140GHTH4C60 140G-HTH4-C60

140GHTH4D10 140G-HTH4-D10

140GHTH4D12 140G-HTH4-D12

140GHTI3C60 140G-HTI3-C60

140GHTI3D10 140G-HTI3-D10

140GHTI3D12 140G-HTI3-D12

140GHTI4C60 140G-HTI4-C60

140GHTI4D10 140G-HTI4-D10

140GHTI4D12 140G-HTI4-D12

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140GIDRA4 140G-I-DRA4

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140GIECM4 140G-I-ECM4

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140GIELP2504 140G-I-ELP2504

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140GIFCS06 140G-I-FCS06

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140GIFMX04 140G-I-FMX04

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