Intel Xeon E5-2640 's Advantages
Higher base frequency (2.5GHz vs 2GHz)
Lower TDP (95W vs 135W)
Intel Xeon E5-2698B v3 's Advantages
Released 2 years and 10 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Larger L3 cache size (40MB vs 15MB)
More modern manufacturing process (22nm vs 32nm)