You should not remove express card while upgrading to Enterprise. For iDRAC to work properly both express and enterprise card should be present on the server.
Morning, My R710 servers all have iDRAC Express and we just bought Enterprise cards.  Dell Support says remove the Express card then add the Enterprise card. Two questions: 1.  Does the Express card have to be removed? 2.  What problems should be expected if both cards are present? Note:  My organization has installed (added) the Enterprise card to a R710 without removing the Express card and indicate there are no noticable problems. I want to make sure there are no "hidden" issues that will negitivly impact things at a later time as most of the servers are at remote locations.  I have recommended the Express card be removed as part of the upgrade as per Dell Supports recomendations.....     
iDRAC Express to Enterprise (do I remove express card)