Intel Xeon E5 1681 v3 's Advantages
Higher specification of memory (2133 vs 4)
Higher base frequency (2.9GHz vs 2.2GHz)
Larger L3 cache size (25MB vs 1.5MB)
Intel Xeon D 1518 's Advantages
Released 6 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (35W vs 135W)