Intel Xeon E5 2667 v2 's Advantages
Released 4 years and 6 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 3.2GHz)
Larger L3 cache size (20MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)
Xeon W5580 's Advantages
Higher specification of memory (1333 vs 3)