Opteron 6276 's Advantages
Higher base frequency (2.3GHz vs 1.5GHz)
Larger L3 cache size (8MB vs 1.5MB)
Intel Xeon D 1557 's Advantages
Released 4 years and 3 months late
Higher specification of memory (4 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 115W)