Xeon W 1390P 's Advantages
Released 5 years and 6 months late
Higher specification of memory (3200 vs 4)
Newer PCIe version (4 vs 3)
Higher base frequency (3.5GHz vs 2.4GHz)
Larger L3 cache size (16MB vs 1.5MB)
Intel Xeon D 1521 's Advantages
Lower TDP (45W vs 125W)