PCI-Express is now the mainstream of expansion cards.
As one-lane PCI-Express x1, high transfer rate to allow more than one lane bundles, x2, x4, x8, x16, x32, there are standards.
500MB / s per lane in PCI Express 1.1 (250MB / s per One way)
1GB / s of double in the PCI Express 2.0 (500MB / s per One way)
2GB / s of double in the PCI Express 3.0 (1GB / s per One way)
"PCI Express 2.0 x 16" is the transfer speed of 1GB / s × 16 = 16GB / s.
Old graphics card.
AGP is "PCI-Express x 16" are replaced.
The PCI expansion card was the mainstream.Now being replaced with PCI-Express.
PCI and PCI-X is compatible. (Limited to operate 3.3V)
"PCI" and "PCI-Express" is not compatible.
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