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Does the PCI Bus Run Independent of the FSB?

By dgower2
May 5, 2005
  1. The question is: Does changing the FSB speed necessarily effect the PCI bus speed or are they mutually exclusive? Does it depend on the chipset? Please don't provide opinions; only respond if you know for sure.
  2. vnf4ultra

    vnf4ultra TechSpot Paladin Posts: 1,360

    The pci bus doesn't have to follow the fsb. Some chipsets can "lock" the pci/agp bus(usually called asynchronous pci/agp in bios). Some motherboards automatically lock the pci bus when you overclock it over a predetermined point.
    Some motherboards don't lock at all, so the higher the fsb, the higher the pci bus, which can lead to fried pci cards and corrupted hard drives.
  3. nein

    nein Banned Posts: 109

    No, not independent. PCI is an Intel's Symmetric Processing (Time-Share/Time-Division Processing) design, the base architecture is that of a hub not a switch.

    It always does for ALL SYMMETRIC PROCESSING designs, they are inherently synchronous by default, "PCI Latency" is the optimized values for perfect symmetrical synchronous time slices. A classical compensation method for pseudo asynchronous independent bus operation is a huge cache per PCI/CPU/any? device, aleviating bus tied-up time-slice conflicts and priority contentions.

    The first Joe User's hardware which could allow PCI bus independent and run asynchronously without a huge cache was AMD's K7s, AMD's K7s are AMD first Distributed Processing designs emulating compatible classical Intel's Symmetric Processing (Time-Share/Time-Division Processing).

    All hub devices (time-share/time-division devices) can operate within a switching architecture without restriction. No switch devices (crossbar devices) can operate within a hub architecture without degraded performance restriction since all hub devices are inherently only synchronous by default, one time slice at a time.

    Only retarded network managers used a network hub as the backbone where all the switches get connected to, it is always the hubs which get connected to a network switch that being used as the bapckbone.
  4. dgower2

    dgower2 TS Maniac Topic Starter Posts: 232

    Wow, thanks for that

    Thanks for the replies.
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