IO Crest Gigabit Ethernet Network LAN PCI-Express Card with Low Profile Bracket SI-PEX24035 Single-Lane (x1) PCI-Express with transfer rate 2.5Gb/s Full Duplex Channel Supports 10/100/1000 Base-T Networking with Auto-Negotiation Compatible with IEEE 802.3, 802.3ab, 802.3u, 802.3x, 802.1Q, VLAN Automatic Crossover Detection and Correction Supported Transmit and Receiving FIFO of 1024 Package Buffer Each for Fast Operation.