Intel Xeon E3 1220L 's Advantages
Higher base frequency (2.2GHz vs 2.1GHz)
Lower TDP (20W vs 120W)
Intel Xeon E5 4660 v3 's Advantages
Released 4 years and 2 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (35MB vs 3MB)
More modern manufacturing process (22nm vs 32nm)