Intel Xeon E5 2620 v2 's Advantages
Lower TDP (80W vs 135W)
Intel Xeon E5 4655 v3 's Advantages
Released 1 years and 9 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (2.9GHz vs 2.1GHz)
Larger L3 cache size (30MB vs 15MB)