Intel Xeon E5 4640 's Advantages
Larger L3 cache size (20MB vs 12MB)
Xeon E 2186M 's Advantages
Released 5 years and 11 months late
Higher specification of memory (2666 vs 3)
Higher base frequency (2.9GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 95W)