Intel Xeon E 2124G 's Advantages
Higher base frequency (3.4GHz vs 3.3GHz)
Lower TDP (72W vs 80W)
Xeon E 2456 's Advantages
Released 5 years and 7 months late
Higher specification of memory (4800 vs 4)
Newer PCIe version (5 vs 3)
Larger L3 cache size (18MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)