The AOC-IBH-003 has Dual 4x DDR InfiniBand ports. It is also capable of using both ports for 10G Ethernet instead. But we do not yet have the version of the 10G Pass-Through to take advantage of both ports. So for now it operates as a single-port 10G NIC. You can also have two 1G switches (or 1G Pass-Throughs) in a Blade enclosure so that you can have three Ethernet LANs from the Blade.