Intel Xeon D 1521 's Advantages
Higher base frequency (2.4GHz vs 2GHz)
Lower TDP (45W vs 67W)
Xeon D 1746TER 's Advantages
Released 6 years and 3 months late
Higher specification of memory (2667 vs 4)
Newer PCIe version (4 vs 3)
Larger L3 cache size (15MB vs 1.5MB)
More modern manufacturing process (10nm vs 14nm)