Intel Xeon E5 2603 's Advantages
Released 2 years and 7 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (10MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (80W vs 130W)
Xeon W5590 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (3.333GHz vs 1.8GHz)