Intel Xeon E 2334 's Advantages
Higher base frequency (3.4GHz vs 3.3GHz)
Lower TDP (65W vs 80W)
Xeon E 2456 's Advantages
Released 2 years and 3 months late
Higher specification of memory (4800 vs 3200)
Newer PCIe version (5 vs 4)
Larger L3 cache size (18MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)