Opteron 6348 's Advantages
Released 8 months late
Higher specification of memory (1866 vs 3)
Higher base frequency (2.8GHz vs 2.1GHz)
Intel Xeon E5 2658 's Advantages
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 8MB)
Lower TDP (95W vs 115W)