Xeon E 2456 's Advantages
Released 8 years and 6 months late
Higher specification of memory (4800 vs 1866)
Newer PCIe version (5 vs 3)
Higher base frequency (3.3GHz vs 1.9GHz)
More modern manufacturing process (10nm vs 22nm)
Lower TDP (80W vs 115W)
Intel Xeon E7 4820 v3 's Advantages
Larger L3 cache size (25MB vs 18MB)