Xeon E 2186M 's Advantages
Released 3 years and 7 months late
Higher specification of memory (2666 vs 1866)
Higher base frequency (2.9GHz vs 2.6GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 90W)
Intel Xeon E5 2640 v3 's Advantages
Larger L3 cache size (20MB vs 12MB)