Intel Xeon D 1521 's Advantages
Higher base frequency (2.4GHz vs 1.8GHz)
Lower TDP (45W vs 165W)
Intel Xeon Gold 5418N 's Advantages
Released 7 years and 2 months late
Higher specification of memory (DDR5-4000 vs DDR3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (45MB vs 1.5MB)
More modern manufacturing process (10nm vs 14nm)