S = PCI – copper

EF = PCI express – fibre
PF = PCI express – fibre
ET = PCI express – copper
PT = PCI express – copper

XF = PCI-X – fibre
MF = PCI-X – fibre
MT = PCI-X – copper
GT = PCI-X – copper

http://forum.pfsense.org/index.php?topic=23934.0

http://communities.intel.com/message/11472#11472

http://www.intel.com/support/network/sb/cs-009221.htm