Intel Xeon E3 1285 v3 's Advantages
Higher base frequency (3.6GHz vs 2.5GHz)
Lower TDP (84W vs 135W)
Intel Xeon E5 1691 v3 's Advantages
Released 1 years and 3 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Larger L3 cache size (35MB vs 8MB)