Xeon E 2186M 's Advantages
Released 7 years late
Higher specification of memory (2666 vs 3)
Higher base frequency (2.9GHz vs 2.2GHz)
Larger L3 cache size (12MB vs 3MB)
More modern manufacturing process (14nm vs 32nm)
Intel Xeon E3 1220L 's Advantages
Lower TDP (20W vs 45W)