Intel Xeon E5 2609 v2 's Advantages
Released 2 years and 5 months late
Higher base frequency (2.5GHz vs 2GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 105W)
Xeon E7 2820 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (18MB vs 10MB)