Intel Xeon E3 1220L 's Advantages
Lower TDP (20W vs 130W)
Intel Xeon E5 2637 v2 's Advantages
Released 2 years and 5 months late
Higher base frequency (3.5GHz vs 2.2GHz)
Larger L3 cache size (10MB vs 3MB)
More modern manufacturing process (22nm vs 32nm)