Intel Xeon E5 1620 v3 's Advantages
Higher specification of memory (DDR4-2133 vs DDR3-1866)
Higher base frequency (3.5GHz vs 2.9GHz)
Larger L3 cache size (10MB vs 6MB)
Intel Xeon E3 1283L v4 's Advantages
Released 9 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (47W vs 140W)