Intel Xeon D 1520 's Advantages
Released 3 years and 11 months late
Higher base frequency (2.2GHz vs 2GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 130W)
Xeon E7 4850 's Advantages
Higher specification of memory (1333 vs 4)
Larger L3 cache size (24MB vs 1.5MB)