Intel Xeon E5 1620 v3 's Advantages
Higher base frequency (3.5GHz vs 3.3GHz)
Intel Xeon W 2155 's Advantages
Released 2 years and 11 months late
Higher specification of memory (2666 vs 2133)
Larger L3 cache size (13.75MB vs 10MB)
More modern manufacturing process (14nm vs 22nm)