Xeon E 2186M 's Advantages
Higher base frequency (2.9GHz vs 1.9GHz)
Lower TDP (45W vs 65W)
Xeon D 2712T 's Advantages
Released 3 years and 10 months late
Higher specification of memory (2667 vs 2666)
Newer PCIe version (4 vs 3)
Larger L3 cache size (15MB vs 12MB)
More modern manufacturing process (10nm vs 14nm)