Opteron 6366 HE 's Advantages
Released 6 months late
Higher specification of memory (1866 vs 3)
Lower TDP (85W vs 95W)
Intel Xeon E5 4640 's Advantages
Newer PCIe version (3 vs 2)
Higher base frequency (2.4GHz vs 1.8GHz)
Larger L3 cache size (20MB vs 8MB)