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PCI-X ("extended") is a 64 bit PCI extension, adding extra fingers to the card. If your comp (server?) supports it then you can probably buy cheap second hand PCI-X cards on ebay and the like, cos it's pretty much obsolete.
PCI Express is a totally different approach, using serial rather than parallel communication, and dedicated channels rather than a shared bus.
It's unfortunate they both use ex* words, there's plenty of potential for confusion...
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