Intel Xeon E5 1681 v3 's Advantages
Higher specification of memory (2133 vs 1866)
Larger L3 cache size (25MB vs 6MB)
Intel Xeon E3 1285 v4 's Advantages
Released 9 months late
Higher base frequency (3.5GHz vs 2.9GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (95W vs 135W)