The OSS target backplane supports a PCIe Gen3 target cable adapter installed in the OSS target slot and up to five PCIe x16 expansion cards installed in the expansion slots. Slots are backward compatible and support Gen1 and Gen2 cards. OSS target backplanes only support OSS target adapters installed the target slot of the backplane. OSS PCIe backplanes support expansion cards designed to the PCIe PCI-SIG specification. This backplane operates with ATX power.