Opteron 6274 's Advantages
Higher base frequency (2.2GHz vs 2GHz)
Lower TDP (115W vs 120W)
Intel Xeon E5 2686 v3 's Advantages
Released 2 years and 10 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (45MB vs 16MB)
More modern manufacturing process (22nm vs 32nm)