Intel Xeon X5647 's Advantages
Higher base frequency (2.933GHz vs 2.5GHz)
Larger L3 cache size (12MB vs 10MB)
Intel Xeon E5 2609 v2 's Advantages
Released 2 years and 7 months late
Newer PCIe version (3 vs 2)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 130W)