Intel Xeon E5 2686 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (2GHz vs 1.9GHz)
Larger L3 cache size (45MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2420 's Advantages
Lower TDP (95W vs 120W)