Solution: Use non-Cisco DACs or SFP/SFP+ Transceivers in Cisco Nexus Devices
With NX-OS devices, you can run a command to allow unsupported transceivers. Obviously, Cisco does not recommend this but it can help when you're in a pinch and need to order more Cisco branded SFPs or DACs. The funny thing is - this command cannot be found in the help so no tab-to-complete!