Intel Xeon E5 1691 v3 's Advantages
Released 3 years and 5 months late
Higher specification of memory (2133 vs 1333)
Higher base frequency (2.5GHz vs 2.4GHz)
Larger L3 cache size (35MB vs 30MB)
More modern manufacturing process (22nm vs 32nm)
Xeon E7 4870 's Advantages
Lower TDP (130W vs 135W)