Intel Xeon E5 1660 's Advantages
Higher base frequency (3.3GHz vs 3.1GHz)
Larger L3 cache size (15MB vs 8MB)
Intel Xeon E3 1220 v3 's Advantages
Released 1 years and 3 months late
Higher specification of memory (1600 vs 3)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 130W)