Intel Xeon E5 2689 Advantages
Newer PCIe version (3 vs 2)
Higher base frequency (2.6GHz vs 1.8GHz)
Larger L3 cache size (20MB vs 8MB)
Opteron 6366 HE Advantages
Released 8 months late
Higher specification of memory (1866 vs 1600)
Lower TDP (85W vs 115W)