Intel Xeon E5 4640 v3 's Advantages
Released 4 years and 2 months late
Higher specification of memory (1866 vs 1333)
Larger L3 cache size (30MB vs 18MB)
More modern manufacturing process (22nm vs 32nm)
Xeon E7 4820 's Advantages
Higher base frequency (2GHz vs 1.9GHz)