Intel Xeon D 1521 's Advantages
Released 8 years and 7 months late
Higher specification of memory (4 vs 2)
Newer PCIe version (3 vs 1)
More modern manufacturing process (14nm vs 90nm)
Lower TDP (45W vs 119W)
Opteron 2222 SE 's Advantages
Higher base frequency (3GHz vs 2.4GHz)