PCI, PCI-X, PCIe, and mini PCI.

A Mini-PCI or Mini Peripheral Component Interconnect is a smaller version of the PCI expansion port.

Its not mini PCI, its just PCI, they just look mini compared to a PCI-E.

It depends on which PCI slot it is, there are tons of different cards that are for PCI.

Sound, wireless, modem.

Look at the spec's for the motherboard to see what slots you have, then you know what cards you can use.

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I don't think so. There are mini PCI-E to PCI-E adapters which would convert the mini to an x1 card, it seems to be very device specific however. I would generally depend on the device - in this case, I found adapters for Wifi cards.