Intel Xeon D 1521 's Advantages
Released 3 years and 8 months late
Higher base frequency (2.4GHz vs 2GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 60W)
Intel Xeon E5 2630L 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Larger L3 cache size (15MB vs 1.5MB)