Intel Xeon E5 4640 v3 's Advantages
Released 5 years and 3 months late
Higher specification of memory (1866 vs 3)
Newer PCIe version (3 vs 2)
Larger L3 cache size (30MB vs 12MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon L5638 's Advantages
Higher base frequency (2GHz vs 1.9GHz)
Lower TDP (60W vs 105W)