Intel Xeon E5 2620 's Advantages
Newer PCIe version (3 vs 2)
Larger L3 cache size (15MB vs 8MB)
Lower TDP (95W vs 115W)
Opteron 6320 's Advantages
Released 8 months late
Higher specification of memory (1866 vs 3)
Higher base frequency (2.8GHz vs 2GHz)