Intel Xeon E5 2667 's Advantages
Higher base frequency (2.9GHz vs 2.2GHz)
Larger L3 cache size (15MB vs 1.5MB)
Intel Xeon D 1520 's Advantages
Released 3 years late
Higher specification of memory (4 vs 3)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 130W)