Sonnet Technologies 1-Port 1 Gigabit Ethernet PCI Express Card Provides Gigabit Ethernet connectivity to Mac Pro and Windows PCs - simple way to add or expand Gigabit Ethernet connectivity to any compatible computer Simple connection - supports gigabit speeds on common CAT-5 cabling Jumbo packets support - supports jumbo packets (Mac and Windows) Full/half duplex 1000/100/10BaseT auto negotiation