Intel Core i5 9400T 's Advantages
Lower TDP (35W vs 65W)
Intel Core i9 13900 's Advantages
Released 3 years and 9 months late
Better graphics card performance
Higher specification of memory (5600 vs 2666)
Larger memory bandwidth (89.6GB/s vs 41.6GB/s)
Newer PCIe version (5.0 vs 3.0)
Higher base frequency (2.0GHz vs 1.8GHz)
Larger L3 cache size (36MB vs 9MB)
More modern manufacturing process (10nm vs 14nm)