Intel Xeon E3 1558L v5 's Advantages
Released 1 years and 8 months late
More modern manufacturing process (14nm vs 22nm)
Lower TDP (45W vs 105W)
Intel Xeon E5 2623 v3 's Advantages
Higher specification of memory (DDR4-1866 vs DDR3)
Higher base frequency (3GHz vs 1.9GHz)
Larger L3 cache size (10MB vs 8MB)