Get the Dell Intel X540-T2 Dual-Port 10GBase-T PCI-E Low-Profile NIC 3DFV8. It is the latest innovation to drive 10 Gigabit Ethernet into the server market.
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Amazon.com: HP Intel X540-T2 10GbE Dual Port Adapter : Electronics
New Intel X540-T2 Dual 10GB RJ45 Ethernet PCI-E with Full half height brackets