Intel Xeon E5 2663 v3 's Advantages
Higher base frequency (2.8GHz vs 2.1GHz)
Lower TDP (105W vs 270W)
Intel Xeon Gold 6538N 's Advantages
Released 9 years and 3 months late
Higher specification of memory (DDR5-5200 vs DDR4-2133)
Newer PCIe version (5 vs 3)
Larger L3 cache size (60MB vs 25MB)
More modern manufacturing process (10nm vs 22nm)