Opteron 2220 's Advantages
Higher base frequency (2.8GHz vs 1.7GHz)
Opteron A1120 's Advantages
Released 8 years and 11 months late
Higher specification of memory (1866 vs 2)
Newer PCIe version (3 vs 1)
More modern manufacturing process (28nm vs 90nm)
Lower TDP (25W vs 95W)