Xeon E 2478 's Advantages
Released 6 years and 4 months late
Higher specification of memory (4800 vs 2666)
Newer PCIe version (5 vs 3)
Larger L3 cache size (24MB vs 13.75MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (80W vs 140W)
Intel Xeon W 2155 's Advantages
Higher base frequency (3.3GHz vs 2.8GHz)