Opteron 6180 SE 's Advantages
Released 4 years late
Higher specification of memory (DDR3-1333 vs DDR2-667)
Newer PCIe version (2 vs 1)
More modern manufacturing process (45nm vs 90nm)
Opteron 8220 's Advantages
Higher base frequency (2.8GHz vs 2.5GHz)
Lower TDP (95W vs 140W)