Intel Xeon E3 1220L 's Advantages
Higher base frequency (2.2GHz vs 1.9GHz)
Lower TDP (20W vs 45W)
Intel Xeon E3 1558L v5 's Advantages
Released 5 years and 1 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (8MB vs 3MB)
More modern manufacturing process (14nm vs 32nm)