Intel Xeon E3 1220L v3 's Advantages
Lower TDP (13W vs 45W)
Intel Xeon E3 1515M v5 's Advantages
Released 2 years and 4 months late
Higher specification of memory (2133 vs 1600)
Higher base frequency (2.8GHz vs 1.1GHz)
Larger L3 cache size (8MB vs 4MB)
More modern manufacturing process (14nm vs 22nm)