Voltaire IB 4X QDR 36-port switch is an internally managed switch. Voltaire IB 4X 324-port switch is a director-class switch that features 324 ports of 40 Gb/s InfiniBand connectivity in a 19U chassis. With Voltaire HyperScale technology, two 324-port switches configured with 648P fabric boards can be connected via CXP cables to form a 648-port 4X QDR switch.