The invention relates to an adapter card for PCI (
peripheral component interconnect ) Express X8 to CPCI (compact
peripheral component interconnect ) Express X8. The adapter card comprises an
impedance control circuit board, an adapting circuit board, a
PCI Express X8 interface, a CPCI Express X8
signal socket, a CPCI Express X8 power supply socket, a
double row socket, a curved needle
double row plug, a connecting block and a baffle, wherein the upper edge of the
impedance control circuit board is crimped with the CPCI Express X8
signal socket and the adapting circuit board; the lower edge is provided with the
PCI Express X8 interface; the curved needle
double row plug is arranged in an inclined left middle part of the
impedance control circuit board; the CPCI Express X8 power supply socket and the curved needle double row plug are installed on the adapting circuit board; the connecting block is used for vertically fixing the impedance
control circuit board and the adapting circuit board trough screws; and the baffle is connected with the impedance
control circuit board and a
computer case through screws. With the adoption of the adapting card for
PCI Express X8 to CPCI Express X8 provided by the invention, the quality and function of signals in the PCI Express X8 and CPCI Express X8 are not affected, application of current PCI Express X8 slots is expanded, and the development difficulty and cost of a CPCI Express X8 interface card is greatly reduced; and the adapting card is simple in structure and convenient in use.