Neptune, also known as Sun Multithreaded 10 GbE, is a dual 10 Gbit/s, multithreaded, PCIe x8-based network interface controller for 10 Gigabit Ethernet. It was developed and originally produced by Sun Microsystems, and later licensed to Marvell Technology Group in 2007. A Neptune-based NIC is integrated in UltraSPARC T2 CPUs (Network Interface Unit, or NIU). NIC Features References External links Sun's Neptune Specs Networking hardware Sun Microsystems hardware