Intel Xeon E5 4640 's Advantages
Lower TDP (95W vs 120W)
Intel Xeon E5 2680 v3 's Advantages
Released 2 years and 4 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (2.5GHz vs 2.4GHz)
Larger L3 cache size (30MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)