Intel Xeon E5 1620 v3 's Advantages
Larger L3 cache size (10MB vs 8.25MB)
Intel Xeon W 2135 's Advantages
Released 2 years and 11 months late
Higher specification of memory (DDR4-2666 vs DDR4-2133)
Higher base frequency (3.7GHz vs 3.5GHz)
More modern manufacturing process (14nm vs 22nm)