The adapters have the following features:

Two or four 10/100/1000 copper ports with RJ45 for Cat 5e/6 cabling
Based on Intel 82580 ASIC (quad-port MAC/PHY controller)
PCIe 2.0 x4 host interface
Low-profile card form factor
Wake on LAN support
Preboot eXecution Environment (PXE) boot support
VLAN support with VLAN tag insertion, stripping, and packet filtering for up to 4096 VLAN tags
iSCSI boot support (built-in software iSCSI initiator)
iSCSI support with native operating system initiators
Jumbo frame support
Intel I/O Acceleration Technology (I/OAT) acceleration
Intel Virtual Machine Device Queues (VMDq) support for VMware with eight queues per port
TCP/IP checksum offload
TCP/IP segmentation offload / large-send offload support


http://www.redbooks.ibm.com/abstracts/tips0765.html?Open