PowerPivot for SharePoint is a collection of server components that provide query processing and management control over PowerPivot workbooks that you publish to SharePoint. Services include the Analysis Services engine and PowerPivot System Service.
Analysis Services provides server-side processing for Excel workbooks that contain PowerPivot data. PowerPivot System Service works alongside Analysis Services, adding SharePoint integration, load balancing and connection management. PowerPivot for SharePoint extends Excel Services by pairing its large scale data processing capability with the data rendering services that Excel provides.
To install PowerPivot for SharePoint, use the SQL Server 2012installation media.
For instructions on advanced deployment scenarios, see Deployment Checklist: Reporting Services, Power View, and PowerPivot for SharePoint and Deployment Checklist: Scale-out by adding PowerPivot Servers to a SharePoint 2010 farm.