Xeon L5639 's Advantages
Higher specification of memory (1333 vs 4)
Larger L3 cache size (12MB vs 8MB)
Lower TDP (60W vs 84W)
Intel Xeon E3 1245 v3 's Advantages
Released 2 years and 4 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.4GHz vs 2.133GHz)
More modern manufacturing process (22nm vs 32nm)