Intel Xeon E3 1275 v5 's Advantages
Higher base frequency (3.6GHz vs 2.5GHz)
Lower TDP (80W vs 270W)
Intel Xeon w7 3455 's Advantages
Released 7 years and 4 months late
Higher specification of memory (4800 vs 2133)
Newer PCIe version (5 vs 3)
Larger L3 cache size (67.5MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)