SRM 5.1.0 is not supported in Server 2012 , ensure that you download 5.1u1 as pervious versions are not compatible.
Data Deduplication in Windows Server 2012
Server 2012 Deduplication Feature Data is growing at a rapid rate and IT Departments have constant challenges to meet storage requirements. Server 2012 introduces a basic Data Deduplication feature which reduces disk sizes using deduplication. Potential Storage savings File Type Content Space Savings User documents Documents, photos, music, videos 30-50% Deployment shares Software binaries, cab files, symbols files 70-80% General... Continue Reading →