Intel Xeon E5 2609 's Advantages
Newer PCIe version (3 vs 2)
Higher base frequency (2.4GHz vs 1.8GHz)
Larger L3 cache size (10MB vs 8MB)
Lower TDP (80W vs 85W)
Opteron 6366 HE 's Advantages
Released 8 months late
Higher specification of memory (1866 vs 3)