Opteron 6180 SE 's Advantages
Higher specification of memory (DDR3-1333 vs DDR3)
Higher base frequency (2.5GHz vs 2.2GHz)
Opteron 6274 's Advantages
Released 9 months late
Larger L3 cache size (16MB vs 12MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (115W vs 140W)