Intel Xeon E5 1620 's Advantages
Newer PCIe version (3 vs 2)
Higher base frequency (3.6GHz vs 3.5GHz)
Larger L3 cache size (10MB vs 8MB)
Opteron 6308 's Advantages
Released 8 months late
Higher specification of memory (1866 vs 3)
Lower TDP (115W vs 130W)