Xeon E 2456 's Advantages
Released 9 years and 3 months late
Higher specification of memory (DDR5-4800 vs DDR4-1866)
Newer PCIe version (5 vs 3)
Higher base frequency (3.3GHz vs 2GHz)
More modern manufacturing process (10nm vs 22nm)
Intel Xeon E5 2628L v3 's Advantages
Larger L3 cache size (25MB vs 18MB)
Lower TDP (75W vs 80W)