Opteron 1381 's Advantages
Higher base frequency (2.5GHz vs 2.4GHz)
Lower TDP (115W vs 129W)
Xeon D 2799 's Advantages
Released 12 years and 8 months late
Higher specification of memory (3200 vs 1333)
Newer PCIe version (4 vs 2)
Larger L3 cache size (30MB vs 6MB)
More modern manufacturing process (10nm vs 45nm)