Mixing Processors Intel supports dual processor (DP) configurations consisting of processors:
1. from the same power optimization segment
2. that support the same maximum Intel QuickPath Interconnect and DDR3 memory speeds
3. that share symmetry across physical packages with respect to the number of logical processor per package, number of cores per package, number of Intel QuickPath interfaces, and cache topology
4. that have identical Extended Family, Extended Model, Processor Type, Family Code and Model Number as indicated by the function 1 of the CPUID instruction