Opteron 6276 's Advantages
Lower TDP (115W vs 135W)
Intel Xeon E5 2667 v3 's Advantages
Released 2 years and 10 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.2GHz vs 2.3GHz)
Larger L3 cache size (20MB vs 8MB)