Intel Core i5 9400 's Advantages
Better graphics card performance
Larger L3 cache size (9MB vs 2MB)
Intel Celeron G5900 's Advantages
Released 1 years and 4 months late
Larger memory bandwidth (42.7GB/s vs 41.6GB/s)
Higher base frequency (3.4GHz vs 2.9GHz)
Lower TDP (58W vs 65W)