Intel Xeon E5 4640 's Advantages
Higher base frequency (2.4GHz vs 2.1GHz)
Lower TDP (95W vs 145W)
Intel Xeon Gold 5423N 's Advantages
Released 10 years and 8 months late
Higher specification of memory (4000 vs 3)
Newer PCIe version (4 vs 3)
Larger L3 cache size (37.5MB vs 20MB)
More modern manufacturing process (10nm vs 32nm)