BCM5708S - 1000/2500BASE-X TOE, RDMA, iSCSI PCI Express® Ethernet Controller

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The BCM5708S is the world's first 2.5 Gigabit controller and is part of the NetXtreme II™ family of C-NICs (converged network interface controllers). By delivering 2.5 Gigabit networking throughput with convergence technology designed to boost server performance (i.e. TCP/IP offload engine, iSCSI, and Remote Direct Memory Access), Broadcom's new C-NIC is able to more than double the throughput of standard Gigabit networking while decreasing overall CPU utilization by up to 5 times. Designed as a cost-point replacement to existing 1GbE implementations, the new 2.5 Gigabit Broadcom® NetXtreme II C-NIC is optimized for embedded blade server applications. 
http://www.broadcom.com/products/Ethernet-Controllers/Enterprise-Server/BCM5708S