| 摘要 |
A peripheral component interconnect express (PCIe) expansion system used to set a motherboard PCIe slot arranged on a motherboard to work in a transmission mode with different transmission lanes includes a basic input/output system (BIOS) set on the motherboard and an expansion card. The expansion card includes a circuit board, three expansion PCIe slots arranged on the circuit board, a converting chip used to detect whether there is a device plugged into any one of the expansion PCIe slots, and an edge connector set on a side of the circuit board to be engaged in the motherboard PCIe slot. The BIOS chip used to set the transmission mode of the motherboard PCIe slot according to a detection result obtained by the converting chip.
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