AMD Ryzen 9 5900X 's Advantages
Released 3 years late
Higher specification of memory (3200 vs 2666)
Larger memory bandwidth (47.68GB/s vs 41.6GB/s)
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (3.7GHz vs 2.8GHz)
Larger L3 cache size (64MB vs 9MB)
More modern manufacturing process (7nm vs 14nm)
Intel Core i5 8400 's Advantages
Integrated graphics card
Lower TDP (65W vs 105W)