I am interested in the Intel Xeon E5-1650 v3 and the Intel Xeon E5-2643 v3 processors. They both have 6 cores and a clock speed of ~3.5GHz. However, the specifications from CPU-world (screenshot) show that the Intel Xeon E5-2643 v3 processor has 2 multiprocessing units as opposed to 1 for the Intel Xeon E5-1650 v3. I am aware of what the difference is between cores and threads, although I am confused why one of the processors has 2 multiprocessing units and the other only 1. What does this mean in practical terms?