Intel Xeon E5 2643 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Higher base frequency (3.4GHz vs 3GHz)
Larger L3 cache size (20MB vs 5MB)
More modern manufacturing process (22nm vs 32nm)
Intel Xeon E5 2637 's Advantages
Lower TDP (80W vs 135W)