PCI Boards
The PCI specification defines several variations on the basic expansion board. The standard defines two official sizes of board, each with three connector arrangements (5 volt, 3.3 volt, and dual voltage). The dimensions of the two board sizes may seem arbitrary, but they owe their heritage to traditional ISA expansion boards. The similarity arose because early PCI-based computers also hosted ISA expansion boards for compatibility reasons. The ISA boards defined the size of the computer, and PCI boards were tailored to fit the space.
Dimensions
A full-size PCI expansion board measures 12.283 inches (312 mm) long. The main body of the board is about 3.875 inches high, although the expansion edge connector and a short skirt extend the ...
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