What are the Maximum Bytes per Foreign Key in SQL Server?

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What are the maximum Bytes per Foreign Key in SQL Server?

SQL Server Supports 900 Bytes per Foreign Key.

Max Capacity For SQL Server 2012 SQL Server 2008 R2 SQL Server 2008 SQL Server 2005
Maximum Bytes per Foreign Key in SQL Server 900 900 900 900

http://msdn.microsoft.com/en-us/library/ms143432.aspx