Intel Xeon E5 1620 's Advantages
Lower TDP (130W vs 140W)
Intel Xeon W 2145 's Advantages
Released 5 years and 5 months late
Higher specification of memory (2666 vs 3)
Higher base frequency (3.7GHz vs 3.6GHz)
Larger L3 cache size (11MB vs 10MB)
More modern manufacturing process (14nm vs 32nm)