Intel Xeon E5 1691 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (35MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 1650 's Advantages
Higher base frequency (3.2GHz vs 2.5GHz)
Lower TDP (130W vs 135W)