The Sun Dual-Port 4x InfiniBand (IB) HCA PCI Express (PCIe) ExpressModule (EM) link uses IB-4x IB cable. IB-4x describes an interface with 8 differential pairs (4 transmit and 4 receive) that support 10 Gbps. The total supported Gbps for 4x is 8 Gbps (less 2 Gbps overhead). The maximum cable length is 17 meters.