Thank you for posting your inquiry. For Dell Optiplex 7040 Linux driver, it is recommended you contact Dell* support as this is a Dell* system which they can provide the most suitable and customized driver designed for their system.
Based from the Dell* website, rhel is not in the list of supported OS for Dell* Optiplex 7040. It is advisable to contact Dell* support for further verification. Kindly take note the link shared below is for reference only and Intel does not guarantee the content.
Please let us know if you have other query related to Intel(R) Network Adapter.