Intel Core i5 12400 's Advantages
Released 2 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 6MB)
More modern manufacturing process (10nm vs 14nm)
Intel Core i3 9100T 's Advantages
Better graphics card performance
Higher base frequency (3.1GHz vs 2.5GHz)
Lower TDP (35W vs 65W)