Intel Xeon E5 2637 v2 's Advantages
Higher base frequency (3.5GHz vs 1.8GHz)
Lower TDP (130W vs 185W)
Intel Xeon Gold 6421N 's Advantages
Released 9 years and 4 months late
Higher specification of memory (4400 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (60MB vs 10MB)
More modern manufacturing process (10nm vs 22nm)