Intel Xeon E5 2686 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (45MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2609 's Advantages
Higher base frequency (2.4GHz vs 2GHz)
Lower TDP (80W vs 120W)