Intel Xeon E3 1278L v4 's Advantages
Released 9 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (47W vs 140W)
Intel Xeon E5 1660 v3 's Advantages
Higher specification of memory (2133 vs 1600)
Higher base frequency (3GHz vs 2GHz)
Larger L3 cache size (20MB vs 6MB)