Opteron A1120 's Advantages
Released 6 years and 10 months late
Higher specification of memory (1866 vs 1333)
Newer PCIe version (3 vs 2)
More modern manufacturing process (28nm vs 45nm)
Lower TDP (25W vs 130W)
Xeon W5580 's Advantages
Higher base frequency (3.2GHz vs 1.7GHz)