Intel Xeon E5 1650 v3 's Advantages
Higher specification of memory (DDR4-2133 vs DDR3)
Higher base frequency (3.5GHz vs 2.4GHz)
Larger L3 cache size (15MB vs 1.5MB)
Intel Xeon D 1521 's Advantages
Released 1 years and 2 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 140W)