Intel Xeon E5 2670 v2 's Advantages
Released 4 years and 6 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (25MB vs 8MB)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (115W vs 130W)
Xeon W5580 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (3.2GHz vs 2.5GHz)