Intel Xeon D 1521 's Advantages
Released 7 years and 5 months late
Newer PCIe version (3 vs 2)
Higher base frequency (2.4GHz vs 2.1GHz)
More modern manufacturing process (14nm vs 65nm)
Lower TDP (45W vs 95W)
Opteron 1352 (B2) 's Advantages
Higher specification of memory (800 vs 4)
Larger L3 cache size (2MB vs 1.5MB)