Intel Atom x7405C 's Advantages
Released 8 years and 5 months late
Higher specification of memory (4800 vs 4)
Larger L3 cache size (6MB vs 1.5MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (12W vs 45W)
Intel Xeon D 1521 's Advantages
Higher base frequency (2.4GHz vs 1.7GHz)