This message was posted on behalf of Intel Corporation
jnyc, Thank you very much for joining the Intel® Processors communities.
In regard to your question, the Intel® E5-2620 v4 processor has not operating system restriction, but the board does. So, the motherboard is the one that indicates which operating systems are supported, by checking the specifications of it you will be able to find out if Windows® 7 Enterprise is fully supported.
Any further questions, please let me know.