Intel Xeon E5 2609 v2 's Advantages
Higher base frequency (2.5GHz vs 1.9GHz)
Lower TDP (80W vs 115W)
Intel Xeon E7 4820 v3 's Advantages
Released 1 years and 9 months late
Higher specification of memory (1866 vs 3)
Larger L3 cache size (25MB vs 10MB)