I am going to have to upgrade an old HP DL 580 G5 to a new Dell R720. The old server has 4 cpu sockets and 128 gigs of ram. The new Dell has two cpu sockets and 120gigs of ram. Will I be able to upgrade the licence across two new Dell R720s since these are only dual socket servers? I will be upgrading from ESX 4 to ESX 5.