PCI-X (Peripheral Component Interconnect — extended) is a variant of PCI that runs twice as fast.
PCIe (aka PCI-E (Peripheral Component Interconnect — Express) or PCI-express) is an Intel variant of PCI that is at least twice as fast but which uses incompatible connectors with 2, 4, 8, 12, 16, or 32 lanes. 8 Lanes is comparable to AGP (Accelerated Graphics Port). Most video cards today are some version of PCI-express X16.
PCI has been revised four times. You must match the version between your video card with the motherboard slot version — PCI-E 1.0, PCI-E 1.0a, PCI-E 2.0, PCI-E 2.1, PCI-E 3.0. You can put a PCI-E 2.1 in a PCI 1.1 slot, but it will run in degraded mode. You cannot put a PCI-E card into a PCI slot, even though the are compatible as far as software goes.
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