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Thread: Separate clocks for CPU, Memory, and everything else?

  1. #1
    Join Date
    Aug 2005
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    Separate clocks for CPU, Memory, and everything else?

    I haven't tried over-clocking yet, so I have a dumb question. Do AMD Athlon64 systems have separate clock frequencies for:
    • CPU
    • Memory
    • Everything else

    I'm slowly coming to understand the inter-relationships between the various clocks (and multipliers and dividers). But I'm confused about something. If you crank up the clock frequencies on the CPU, and on the memory, then does this also crank up the clock frequency on other things? Such as the interface to:
    1. USB ports
    2. Firewire ports
    3. SATA ports
    4. IDE ports
    5. Audio ports
    6. PCI bus, or
    7. PCI-express bus.

    Or do those all derive their clocks separately? Could those other interfaces start to fail, if the CPU/Memory frequencies are turned-up?

  2. #2
    Resident abit mourner BUFF's Avatar
    Join Date
    Jul 2003
    Sunny Glasgow
    181 times in 171 posts
    They are all derived from a reference clock but yes the CPU, memory, PCI/SATA & PCI-E all have their own speeds.
    If you have a half-decent mobo you will have locks on the PCI, SATA & PCI-E so that you can vary the CPU's clock without affecting them.
    The memory speed will vary with the CPU's bus speed but you can use dividers to keep the memory within it's limits.

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