Resource Governor was first introduced in SQL Server 2008. SQL Server 2012 provides enhancements to the Resource Governor that enable you to more effectively govern performance, especially for machines with a large number of CPU cores. The enhancements include the following:
Support for up to 64 resource pools, an increase from the previous maximum of 20, to better enable partitioning larger machines between more workloads
CAP_CPU_PERCENT option for resource pools to provide a means of setting a hard-cap ...