whats the differnce between a pci n pci-e graphics card

PCI is an older parallel interface (information is sent "side by side") with a maximum transfer speed of 33 mhz and a maximum bandwidth of 133 mb/s. PCI-e is a much newer serial interface (information is sent "in a row"). A single PCI-e lane (PCI-e X16 for instance, has 16 lanes), has a transfer speed of 100 Mhz, with a maximum bandwidth of 5 gb/s. Once you start adding these lanes up, you get PCI-e X1, X4, X8, X16. PCI-e X16 has 16 PCI-e lanes so it has a maximum bandidth of 80 gb/s. As you can see PCI-e has no relation at all to PCI.
 
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