Opteron X2 185 's Advantages
Higher base frequency (2.6GHz vs 2.25GHz)
Lower TDP (110W vs 225W)
AMD EPYC 7742 's Advantages
Released 13 years and 5 months late
Higher specification of memory (DDR4-3200 vs DDR1-400)
More modern manufacturing process (7nm vs 90nm)