Intel Xeon E5 1620 v3 's Advantages
Higher base frequency (3.5GHz vs 3GHz)
Lower TDP (140W vs 250W)
Intel Xeon W 3345 's Advantages
Released 6 years and 10 months late
Higher specification of memory (3200 vs 2133)
Newer PCIe version (4 vs 3)
Larger L3 cache size (36MB vs 10MB)
More modern manufacturing process (10nm vs 22nm)