Intel Xeon E3 1575M v5 's Advantages
Released 6 years and 10 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 45nm)
Lower TDP (45W vs 130W)
Xeon W5580 's Advantages
Higher base frequency (3.2GHz vs 3GHz)