Xeon E 2456 's Advantages
Released 9 years and 3 months late
Higher specification of memory (4800 vs 2133)
Newer PCIe version (5 vs 3)
Higher base frequency (3.3GHz vs 3GHz)
More modern manufacturing process (10nm vs 22nm)
Lower TDP (80W vs 140W)
Intel Xeon E5 1660 v3 's Advantages
Larger L3 cache size (20MB vs 18MB)