Intel Xeon E3 1515M v5 's Advantages
Released 1 years and 4 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 140W)
Intel Xeon E5 1620 v3 's Advantages
Higher specification of memory (2133 vs 2133)
Higher base frequency (3.5GHz vs 2.8GHz)
Larger L3 cache size (10MB vs 8MB)