Intel Xeon E3 1275 v3 's Advantages
Released 4 years and 3 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.5GHz vs 3.2GHz)
More modern manufacturing process (22nm vs 45nm)
Lower TDP (84W vs 130W)
Xeon W5580 's Advantages
Higher specification of memory (1333 vs 4)