Do we need to format data and log files with 64k cluster size for sql server 2012?

Do we need to format data and log files with 64k cluster size for sql server 2012?
Does this best practice still applies to sql server 2012 & 2014?

Yes.  The extent size of SQL Server data files, and the max log block size have not changed with the new versions, so the guidance should remain the same.
Microsoft SQL Server Storage Engine PM

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