Welcome guest. Before posting on our computer help forum, you must register. Click here it's easy and free.

Author Topic: PCIe Backwards Compatible?  (Read 1831 times)

0 Members and 1 Guest are viewing this topic.

qz33

    Topic Starter


    Rookie
    PCIe Backwards Compatible?
    « on: January 30, 2008, 09:25:02 AM »
    Just real quick-

    I know old PCI cards can be used with PCIe connectors but the speed will be old PCI speed.

    Can PCIe cards be used with PCI connectors?  I doubt it.

    socrates



      Apprentice

    • I know nothing except for the fact of my ignorance
    • Thanked: 21
      • Yes
    • Computer: Specs
    • Experience: Guru
    • OS: Mac OS
    Re: PCIe Backwards Compatible?
    « Reply #1 on: January 30, 2008, 09:29:34 AM »
    no they cannot.

    socrates



      Apprentice

    • I know nothing except for the fact of my ignorance
    • Thanked: 21
      • Yes
    • Computer: Specs
    • Experience: Guru
    • OS: Mac OS
    Re: PCIe Backwards Compatible?
    « Reply #2 on: January 30, 2008, 09:32:07 AM »
    I should say a bit more.

    The reason why is because the pci slot is too old of technology to recognize the pci-e card.  However, the pci-e slot is newer technology, and is therefore able to read the new and old technology (pci-e cards and pci cards). 

    Deerpark



      Egghead
    • Thanked: 1
      Re: PCIe Backwards Compatible?
      « Reply #3 on: January 30, 2008, 09:49:38 AM »
      And to add to that.... as far as I know PCI-E is only compatible with PCI on the software level. You can't actually install a PCI card in a PCI-E slot.
      Any sufficiently advanced technology is indistinguishable from magic.
      Arthur C. Clarke (1917 - 2008)

      socrates



        Apprentice

      • I know nothing except for the fact of my ignorance
      • Thanked: 21
        • Yes
      • Computer: Specs
      • Experience: Guru
      • OS: Mac OS
      Re: PCIe Backwards Compatible?
      « Reply #4 on: January 30, 2008, 09:51:31 AM »
      And to add to that.... as far as I know PCI-E is only compatible with PCI on the software level. You can't actually install a PCI card in a PCI-E slot.

      yes, I believe that's correct.

      qz33

        Topic Starter


        Rookie
        Re: PCIe Backwards Compatible?
        « Reply #5 on: January 31, 2008, 08:12:39 AM »
        And to add to that.... as far as I know PCI-E is only compatible with PCI on the software level. You can't actually install a PCI card in a PCI-E slot.

        yes, I believe that's correct.

        If this is true then what purpose does PCI-E backwards compatability with old PCI cards serve?
        How come this is listed as an advantage for PCI-E?  I thought old cards were still supposed to be useable with the new slots.

        socrates



          Apprentice

        • I know nothing except for the fact of my ignorance
        • Thanked: 21
          • Yes
        • Computer: Specs
        • Experience: Guru
        • OS: Mac OS
        Re: PCIe Backwards Compatible?
        « Reply #6 on: January 31, 2008, 09:13:01 AM »
        Good question.

        Deerpark



          Egghead
        • Thanked: 1
          Re: PCIe Backwards Compatible?
          « Reply #7 on: January 31, 2008, 10:25:43 AM »
          The point is, if you have software that is purpose written to interface with a specific PCI card, you can change the card to an equivalent PCI-E card and the software will continue to function.
          The average user will probably never be in a situation where this is an advantage but for enterprises this could potentially save them a lot of money. It will make it a lot more compelling to switch to PCI-E architecture if companies only have to change their hardware and not rewrite their software.
          Any sufficiently advanced technology is indistinguishable from magic.
          Arthur C. Clarke (1917 - 2008)