Intel Xeon D 1521 's Advantages
Released 9 years and 3 months late
Newer PCIe version (3 vs 1)
More modern manufacturing process (14nm vs 90nm)
Lower TDP (45W vs 120W)
Opteron 8220 SE (F3) 's Advantages
Higher specification of memory (667 vs 4)
Higher base frequency (2.8GHz vs 2.4GHz)