Intel Xeon E5 1691 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (35MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 4650L 's Advantages
Higher base frequency (2.6GHz vs 2.5GHz)
Lower TDP (115W vs 135W)