The QX550 is a PCIe network card with four 10GBASE-T interfaces based on two Intel X550-AT2 dual Ethernet controllers. For compatibility with mainboards without PCIe slot bifurcation support, both controllers are combined via a PCIe 3.0 switch. The Platform Sync Board (PSB) is a b-plus I/O board as (g)PTP master for the QX550. It supports an Intel i210IT to synchronize the clocks to or from external devices. The U-blox GPS module, PPS in/out and the PCIe UART with NMEA support enable internal time synchronization or synchronization with external grand master clocks. The PSB does not require its own PCIe slot, but is operated via a cable connection from the QX550 Master.