Intel Xeon E3 1275 v2 's Advantages
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 2.3GHz)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (77W vs 99W)
Opteron 6338P 's Advantages
Released 1 years and 8 months late
Higher specification of memory (1600 vs 3)