Intel Xeon E5 1686 v3 's Advantages
Higher specification of memory (DDR4-2133 vs DDR3-1866)
Larger L3 cache size (30MB vs 6MB)
Intel Xeon E3 1284L v4 's Advantages
Released 9 months late
Higher base frequency (2.9GHz vs 2.6GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (47W vs 135W)