Intel Core i5 12400 's Advantages
Released 3 years and 9 months late
Higher specification of memory (4800 vs 2400)
Larger memory bandwidth (76.8GB/s vs 37.5GB/s)
Newer PCIe version (5.0 vs 3.0)
Larger L3 cache size (18MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)
Intel Core i3 8300 's Advantages
Better graphics card performance
Higher base frequency (3.7GHz vs 2.5GHz)
Lower TDP (62W vs 65W)