Xeon Series Processors

4 Core CPU

Intel Xeon E5 2609 (4 core)

6 Core CPU

Intel Xeon E5 2630 (6 core)
Intel Xeon E5 2640 (6 core)

8 Core CPU

Intel Xeon E5 2650 (8 core)
Intel Xeon E5 2690 (8 core)

This are supported CPU which is highly recommended by  Tonymacx86