PCI compatibility of old PCI chipsets and "newer" GPUs?

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  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8701
    • USA

    #1

    PCI compatibility of old PCI chipsets and "newer" GPUs?

    I could have sworn my PCI ATI Radeon 9250 was working, but when I stuck it in an old 82430TX P5 board, it didn't work... is this expected?

    I suppose I'll need to test it in a AGP board to see if it works or not, but this struck me as weird.
  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8701
    • USA

    #2
    hmm. nope, he's dead, Jim.
    Or at least they don't like the BX board either.

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30998
      • Albion

      #3
      there are several revisions of pci like there are of agp.
      no, i dont know the details

      one other thing, be wary of any card salvaged from a powerPC based mac,
      they could run the pci at double-speed!

      Comment

      • eccerr0r
        Solder Sloth
        • Nov 2012
        • 8701
        • USA

        #4
        Yeah there was a pci 2.2 and 2.1 that I recall that was an issue where the pci2.2 required 3v3 on the bus, the older 2.1 all had LDOs on 5v to power 3v3 devices or something like that. But I think these were all 2.1 or older, I don't recall ever getting many 2.2 cards.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30998
          • Albion

          #5
          also any card sold for a mac had a different bios.
          those need to be re-flashed with the pc version.
          i had a bunch of Adaptec scsi cards like that - seller thought they where dead, just needed a bios change.

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 30998
            • Albion

            #6
            hmm...
            why does it have 2 keyways?
            https://www.techpowerup.com/gpu-specs/radeon-9250.c45

            ah yes, it's AGP

            Comment

            • m1ch43lzm
              Badcaps Veteran
              • Mar 2019
              • 389
              • Peru

              #7
              Test on the AGP system with both AGP and PCI cards installed, set the BIOS to "Init display first" AGP
              Monitor connected to the AGP card of course...

              Boot into the OS and check if the PCI card is detected there

              As for 3.3V/5V, the slot is keyed differently, you either have a 5V card, or universal 3.3v/5V
              None of the PC motherboards I have (dead or working) have 3.3V 32 bit PCI slots

              5V PCI 32bit
              Click image for larger version

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              Universal 3.3V/5V PCI 32bit
              Click image for larger version

Name:	PCI Extcard 32 Bit mit 3,3V und 5V.jpg
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