Opteron 6180 SE 's Advantages
Higher specification of memory (DDR3-1333 vs DDR3)
Higher base frequency (2.5GHz vs 2.3GHz)
Intel Xeon E5 2649 v3 's Advantages
Released 3 years and 7 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (25MB vs 12MB)
Lower TDP (105W vs 140W)