Product details:

The HP 4X DDR IB Mezzanine HCA is a single-port 4X DDR InfiniBand PCI-Express Mezzanine adapter for HP c-Class server blades. The HP 4X DDR IB Mezzanine HCA can be plugged into PCI-Express connectors on HP c-Class server blades; however, to obtain the best performance, it is required to plug the HCA into the x8 PCI-Express connector on the server blades. The HP 4X DDR IB Switch Module is a double wide switch module for the c-Class enclosure. It has 16 downlinks to connect up to 16 server blades in the enclosure, and 8 uplinks to connect to the external InfiniBand switches to build an InfiniBand fabric. All links conform to InfiniBand Trade Association (IBTA) specifications. A subnet manager is required to establish an InfiniBand fabric. OpenSM from OpenFabric Enterprise Distribution can also be used to establish an InfiniBand fabric; however, support for OpenSM is only available from the OpenFabrics community.