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Those are similar with origin,but different, As per Alberto Ferrari very good white paper on this subject
In SQL 2012 the xVelocity engine comes in two different flavors:xVelocity in-memory analytics engine, also known as Vertipaq, is the in-memory engine that runs inside Analysis Services 2012 for Tabular models.xVelocity memory optimized ColumnStore index, is the same technology implemented in the SQL Server engine, in the form of non-clustered columnar indexes
In SQL 2012 the xVelocity engine comes in two different flavors:
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