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Question On PC Bus Architecture

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  • Question On PC Bus Architecture


    Simple question, a bit of clarification ...

    Is 64-bit/66MHz PCI a form of PCI-X?

    I'm asking because I know my DELL 1600SC server has 2 x PCI-X slots but I'm looking at buying an Adaptec 3410S 1917400 U160 SCSI Raid Controller Card (64-bit/66MHz PCI) off eBay and trying to figure if it's compatible.

    Any help appreciated

    J C Rocks (An Aspiring Author's Journey)
    The Abyssal Void War: Stars, Hide Your Fires

  • #2
    Re: Question On PC Bus Architecture

    As far i can can remember the PCI-X slot you are thinking of is an extension of the PCI slot.


    • #3
      Re: Question On PC Bus Architecture

      The Adaptec SCSI RAID 3410S card is a four-channel Ultra160 Adaptec SCSI RAID solution featuring a true 64-bit/66MHz 80303 microprocessor. Supports up to 256 MB cache memory and a Battery Backup Module option. Features include S.M.A.R.T., SES/SAF-TE, OCE and background initialization. RAID levels 0, 1, 0/1, 5, 0/5 and JBOD.

      PCI-X is generally backward-compatible with most cards based on the PCI 2.x[1] or later standard, meaning that, a PCI-X card can be installed in a PCI slot, provided it has the correct voltage keying for the slot and (if inserting into a 32-bit slot) nothing obstructs the overhanging part of the edge connector. Originally the PCI bus was a 5-volt bus. Later, in PCI Revision 2.x, the PCI bus was a dual-voltage interconnect. In 3.0 this was changed to 3.3 volts only. The PCI-X bus is not compatible with the older 5-volt cards but newer 3.3-volt PCI cards will work in a PCI-X slot.[1] Apart from this, PCI and PCI-X cards can generally be intermixed on a PCI-X bus, but the speed will be limited to the speed of the slowest card. For example, a PCI 2.3 device running at 32 bits and 66 MHz on a PCI-X 133-MHz bus will limit the total throughput of the bus to 266 MB/s. To get around this limitation and the voltage compatibility issue, many motherboards have separate PCI-X channels that can be dedicated to different PCI hardware families if needed, allowing for better backward compatibility while maintaining higher total system bandwidth.
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