Xeon EC5549 's Advantages
Higher base frequency (2.533GHz vs 1.9GHz)
Intel Xeon E3 1558L v5 's Advantages
Released 6 years and 3 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 45nm)
Lower TDP (45W vs 85W)