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  1. #1
    Join Date
    Jul 2002
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    Question Question about AMD64 chip

    why some AMD64 chip FSB is intergated into the chip while some FSB are 800mhz.

    what's the different?

  2. #2
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    Dec 2002
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    The Front Side Bus on all AMD64 processors is integrated into the chip. When you hear people refer to it as a 800MHz FSB they are actually letting you know that there is a 800MHz HyperTransport Link between the Processor and the Motherboard. On more modern motherboards, such as nForce3 Ultra and nForce4 chipsets the Hypertransport Bus actually runs at 1.0GHz.
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  3. #3
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    Jul 2002
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    ok. thank. it was confusing since i tho all AMD64 FSB are intergrated to the chip so the 800mhz is refering to cpu to mobo. would it make AMD64 FSB basically the same as Intel's P4 since their FSB is also 800mhz.

  4. #4
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    Apr 2005
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    Atlanta, Georgia
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    Originally posted by jt2377
    ok. thank. it was confusing since i tho all AMD64 FSB are intergrated to the chip so the 800mhz is refering to cpu to mobo. would it make AMD64 FSB basically the same as Intel's P4 since their FSB is also 800mhz.
    the P4's bus is not actually 800MHz that is a myth.

    It is a "quad pumped" 200mhz bus

  5. #5
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    AMD64 don't have FSB per se. HyperTransport link in the CPU itself is supposed to be 1600mhz, though.
    Can you be scared half to death twice?

  6. #6
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    Oct 2004
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    Southwest UK
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    That's right, on the AMD, the memory transport is on-CPU so there is no need to go via the northbridge controller anymore, the CPU hits the memory bus directly. This, apparently, means that memory access is a lot faster and more efficient.

    They say that the old FSB method of communication will run at 2.1Gb/sec where as HyperTransport will do 6.4Gb/s.

    http://www.devx.com/amd/Article/17437

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