Xeon E 2456 's Advantages
Released 5 years and 7 months late
Higher specification of memory (DDR5-4800 vs DDR4-2666)
Newer PCIe version (5 vs 3)
Larger L3 cache size (18MB vs 12MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (80W vs 95W)
Xeon E 2186G 's Advantages
Higher base frequency (3.8GHz vs 3.3GHz)