A test apparatus for testing peripheral component interconnect express (PCIe) signals transmission of a motherboard includes a printed circuit board including an edge connector, a number of first switches having a same number with the type of the PCIe signals to be test, an encoder, and a microprocessor. The first switches are used to select a type selection signal. The encoder converts signals outputted from the first switches to binary data. The microprocessor outputs clock signals to a PCIe controller according to the binary data to make the PCIe controller transmit the PCIe signal to the PCIe slot.
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