Intel Xeon D 1521 's Advantages
Higher base frequency (2.4GHz vs 2.1GHz)
Lower TDP (45W vs 120W)
Intel Xeon Silver 4310 's Advantages
Released 5 years and 5 months late
Higher specification of memory (2667 vs 4)
Newer PCIe version (4 vs 3)
Larger L3 cache size (18MB vs 1.5MB)
More modern manufacturing process (10nm vs 14nm)