Intel Xeon E5 2683 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (35MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2640 's Advantages
Higher base frequency (2.5GHz vs 2GHz)
Lower TDP (95W vs 120W)