Intel Xeon E5 4620 's Advantages
Lower TDP (130W vs 135W)
Intel Xeon E5 1691 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (2.5GHz vs 2.2GHz)
Larger L3 cache size (35MB vs 16MB)
More modern manufacturing process (22nm vs 32nm)