Xeon E 2176M 's Advantages
Lower TDP (45W vs 80W)
Xeon E 2456 's Advantages
Released 5 years and 8 months late
Higher specification of memory (4800 vs 2666)
Newer PCIe version (5 vs 3)
Higher base frequency (3.3GHz vs 2.7GHz)
Larger L3 cache size (18MB vs 12MB)
More modern manufacturing process (10nm vs 14nm)