Intel Xeon E5 2660 's Advantages
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 8MB)
Lower TDP (95W vs 115W)
Opteron 6380 's Advantages
Released 8 months late
Higher specification of memory (1866 vs 3)
Higher base frequency (2.5GHz vs 2.2GHz)