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In general, you can upgrade from your current edition to of SQL Server to the equivelant or higher editions.
For instance, you can upgrade from the SQL Server 2008 R2 SP2 Datacenter edition (the highest for that release) to the SQL Server 2013 Enterprise or Business Intelligence editions.
For a complete list of supported upgrade paths to SQL Server 2014 you can refer to Supported Version and Edition Upgrades SQL Server 2014 is designed to run on a wide range of computer systems from laptop and desktop systems to enterprise class systems.
The minimum processing requirement for a 32-bit x86 implementation is a 1.0 GHz CPU, while the 64-bit x64 implementation has a recommended minimum of a 1.4 GHz processor.
To initiate the upgrade to SQL Server 2014 you can execute the Autorun program from the SQL Server 2014 installation media or you can launch the program found in the installation media’s root directory.
These options will both start the SQL Server Installation Center which you can see in Figure 1.
The Upgrade Advisor will warn you about changes or depreciated features that might affect your system upgrade.
You can optionally generate a report from the Upgrade Advisor that you can use to systematically address any potential upgrade problems.
Some people recommend performing a full backup followed by a clean install of SQL Server on a new operating system. Then you need to restore any custom SQL Server settings and properties that you may have changed.Alternatively, performing an in-place upgrade is much faster as you only need to install the need SQL Server version over top of the old one. Some database pros say this method is safer because you know you’ll be running with the same settings and they don’t like to change an otherwise stable system.I have performed both successfully many times in the past.SQL Server 2014 is designed to run in wide variety of situations and each different SQL Server 2014 edition has different operating system requirements.In addition, the 32-bit x86 versions and the 64-bit x64 versions of the different SQL Server 2014 editions also have somewhat different operating system requirements.