Intel Core i5 9400 's Advantages
Lower TDP (65W vs 170W)
AMD Ryzen 9 7950X 's Advantages
Released 3 years and 7 months late
Better graphics card performance
Higher specification of memory (5200 vs 2666)
Larger memory bandwidth (73.4GB/s vs 41.6GB/s)
Newer PCIe version (5.0 vs 3.0)
Higher base frequency (4.5GHz vs 2.9GHz)
Larger L3 cache size (64MB vs 9MB)
More modern manufacturing process (5nm vs 14nm)