PCIe 16 Reed Relay Output Digital Interface - Sealevel
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PCIe 16 Isolated Input Digital Interface (3-13V) - Sealevel
PCIe x16 Riser Set for M1U04 and M1U05 9.8" Mini 1U Rackmount Case – MITXPC
PCIe-DA16-16 Family Analog Output Card - ACCES I/O Products
16 port High Speed 921.6K Serial RS232 PCI Express Card - Shentek
The difference between PCIe x1, x4, x8, x16 - DuroPC Industrial Computers