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I found the following on wikipedia. "Typical PCI cards present either one or two key notches, depending on their signaling voltage. Cards requiring 3.3 volts have a notch 56.21mm from the front of the card (where the external connectors are) while those requiring 5 volts have a notch 104.47mm...

Actually it is a PCI-X not a PCI-Express. I would like to add a sound card. I guess I'll have toemail manufacturers to find wich cards the make offer a Universal keyed card. Jerry

Hello, My computer has two PCI-X slots the HP website say that they will use universal keyed PCI cards. What exactly is a universal keyed PCI card? are all PCI card universal keyed? If not how can I find out if one I have is? Jerry C Lunsford