Xeon E5405 's Advantages
Lower TDP (80W vs 160W)
Intel Xeon E5 2687W v3 's Advantages
Released 6 years and 10 months late
Higher specification of memory (2133 vs 3)
Newer PCIe version (3 vs 2)
Higher base frequency (3.1GHz vs 2GHz)
More modern manufacturing process (22nm vs 45nm)