https://www.cisco.com/c/en/us/obsolete/interfaces-modules/cisco-10gbase-cx4-x2-module.html
Cisco 10GBASE-CX4 X2 Module - Retirement Notification - Cisco
The Cisco 10GBASE-CX4 X2 Module has been retired and is no longer supported.
10gbase cx4ciscox2moduleretirement