Intel Core i5 9500 's Advantages
Higher base frequency (3.0GHz vs 1.8GHz)
Intel Core i5 12400T 's Advantages
Released 2 years and 9 months late
Higher specification of memory (4800 vs 2666)
Larger memory bandwidth (76.8GB/s vs 41.6GB/s)
Newer PCIe version (5 vs 3.0)
Larger L3 cache size (18MB vs 9MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (35W vs 65W)