Intel Xeon E3 1558L v5 's Advantages
Released 11 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 120W)
Intel Xeon E5 4660 v3 's Advantages
Higher specification of memory (2133 vs 2133)
Higher base frequency (2.1GHz vs 1.9GHz)
Larger L3 cache size (35MB vs 8MB)