Intel Xeon E5 1680 v2 's Advantages
Released 4 years and 6 months late
Higher specification of memory (1866 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (25MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)
Xeon W5580 's Advantages
Higher base frequency (3.2GHz vs 3GHz)