Intel Xeon E5 2640 's Advantages
Lower TDP (95W vs 115W)
Intel Xeon E5 2680 v2 's Advantages
Released 1 years and 6 months late
Higher base frequency (2.8GHz vs 2.5GHz)
Larger L3 cache size (25MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)