Intel Xeon E5 2697 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (DDR4-2133 vs DDR3)
Larger L3 cache size (35MB vs 10MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2643 's Advantages
Higher base frequency (3.3GHz vs 2.6GHz)
Lower TDP (130W vs 145W)