Xeon L5639 's Advantages
Larger L3 cache size (12MB vs 10MB)
Lower TDP (60W vs 140W)
Intel Xeon E5 1603 v3 's Advantages
Released 3 years and 7 months late
Higher specification of memory (1866 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (2.8GHz vs 2.133GHz)
More modern manufacturing process (22nm vs 32nm)