Xeon L5639 's Advantages
Higher base frequency (2.133GHz vs 2GHz)
Lower TDP (60W vs 120W)
Intel Xeon E5 2683 v3 's Advantages
Released 3 years and 7 months late
Higher specification of memory (2133 vs 1333)
Newer PCIe version (3 vs 2)
Larger L3 cache size (35MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)