Intel Xeon E5 2686 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (2GHz vs 1.8GHz)
Larger L3 cache size (45MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2603 's Advantages
Lower TDP (80W vs 120W)