Xeon E 2186M 's Advantages
Released 5 years and 5 months late
Higher specification of memory (2666 vs 1866)
Newer PCIe version (3 vs 2)
Larger L3 cache size (12MB vs 8MB)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 115W)
Opteron 6308 's Advantages
Higher base frequency (3.5GHz vs 2.9GHz)