Intel Xeon E3 1225 v2 's Advantages
Higher base frequency (3.2GHz vs 2.4GHz)
Lower TDP (77W vs 85W)
Intel Xeon E5 2620 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (DDR4-1866 vs DDR3)
Larger L3 cache size (15MB vs 8MB)