Opteron 6308 's Advantages
Released 8 months late
Higher specification of memory (1866 vs 3)
Higher base frequency (3.5GHz vs 3.3GHz)
Lower TDP (115W vs 130W)
Intel Xeon E5 2643 's Advantages
Newer PCIe version (3 vs 2)
Larger L3 cache size (10MB vs 8MB)