Brand new unused. I bought 2 a few years ago from Amazon, one is still being used. This one is NEW!

Intel Ethernet converged network Adapter X540-T2 10GBase-T Dual port, passive heatsink, PCIe 21 (5GT/s), standard Cat6a cabling With RJ45 connectors
Design that delivers high availability, scalability, and for maximum flexibility and price/performance
Low cost, low power, 10 Gigabit Ethernet (10GbE) performance for the entire data center
Low cost, low power, 10 Gigabit Ethernet (10GbE) performance for the entire data center
Standard CAT-6a cabling with RJ45 connectors
Backward compatibility with existing 1000Base-T networks simplifies the transition to 10GbE
Flexible I/O virtualization for port partitioning and quality of service (QoS) of up to 64 virtual ports
Unified Networking Delivering Lan, Iscsi, And Fcoe In One Low Cost Cna
Industry First Dual-Port 10Gbase-T Adapter With Single-Chip Solution With Integrated Mac + Phy
Reliable and proven 10 Gigabit Ethernet technology from Intel corporation

ref link:
https://ark.intel.com/content/www/us/en/ark/products/58954/intel-ethernet-converged-network-adapter-x540-t2.html

https://www.amazon.com/Intel-Converged-Network-Adapter-X540T2/dp/B0077CS9UM