Sonnet GE1000LA2X-E interface cards/adapter

GE1000LA2X-E, PCIe - 2x RJ-45, 10/100/1000 BaseT Dual Port Network Connection
Whether you need to add more Gigabit Ethernet ports to your server for improved performance and reliability or the ability to connect your computer to more networks, get a Sonnet Presto™ Gigabit PCIe Server dual-port Gigabit Ethernet adapter card for PCI Express for an advanced networking solution! This 4-lane (x4) PCI Express card supports link aggregation(1) on its own and with your computer’s onboard Gigabit Ethernet ports and full duplex communication to achieve up to 2000 Mbps and faster transfer rates—the ideal solution for high-bandwidth data transfer requirements. Presto Gigabit Ethernet PCIe Server also supports 9000 byte jumbo packet transfers (compared to 1500 byte standard packets) to support higher performance and reduced overhead when transferring large files. Should a cable get unplugged or a port fail, Presto Gigabit PCIe Server provides transparent failover protection, so your computer remains connected to the network.
Presto Gigabit PCIe Server supports gigabit speeds over common CAT-5 cabling, so costly cable replacement is unnecessary. If your computer already has onboard Gigabit Ethernet, you can add a Presto Gigabit PCIe Server and use it for dedicated connection to a printer, AirPort® Extreme base station, DSL or cable modem, or a video server, while leaving your onboard Gigabit Ethernet port(s) available for other connections.
Presto Gigabit PCIe Server is compatible in Mac Pro®(2), and Power Mac® G5 & Xserve(3) & PCs and servers with a PCI Express (PCIe) slot. Offering simple configuration, this Sonnet card is easy to use, and its support for 1000/100/10BaseT auto-negotiation and full/half duplex communication enable it to be used in most networks.