Intel Xeon E5 2643 v2 's Advantages
Released 10 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (15MB vs 8MB)
More modern manufacturing process (22nm vs 32nm)
Opteron 6308 's Advantages
Higher specification of memory (1866 vs 3)
Lower TDP (115W vs 130W)