Intel Xeon Platinum 8558P 's Advantages
Released 8 years and 1 months late
Higher specification of memory (4800 vs 4)
Newer PCIe version (5 vs 3)
Higher base frequency (2.7GHz vs 2.4GHz)
Larger L3 cache size (260MB vs 1.5MB)
More modern manufacturing process (7nm vs 14nm)
Intel Xeon D 1521 's Advantages
Lower TDP (45W vs 350W)