Opteron 3320 EE 's Advantages
Higher base frequency (1.9GHz vs 1.5GHz)
Larger L3 cache size (8MB vs 1.5MB)
Lower TDP (25W vs 45W)
Intel Xeon D 1557 's Advantages
Released 3 years and 2 months late
Higher specification of memory (4 vs 3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 32nm)