Intel Xeon D 1520 's Advantages
Higher base frequency (2.2GHz vs 2.1GHz)
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 135W)
Intel Xeon E5 4669 v3 's Advantages
Higher specification of memory (2133 vs 4)
Larger L3 cache size (45MB vs 1.5MB)