http://www.intel.com/Assets/PDF/prodbrief/320116.pdf says it runs off the 82576 controller.
http://download.intel.com/design/network/ProdBrf/320025.pdf shows jumbo frame support, and iSCSI boot support - nothing about iSCSI offload, though.
Thanks for helping me with that. I presume it does support iSCSI offload but it's not such a big deal if it doesn't. The jumbo frames is necessary for my project.