Intel Xeon E5 1660 's Advantages
Higher base frequency (3.3GHz vs 2.9GHz)
Larger L3 cache size (15MB vs 12MB)
Xeon E 2186M 's Advantages
Released 6 years and 1 months late
Higher specification of memory (2666 vs 3)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 130W)