Intel Core i5 9400 's Advantages
Higher base frequency (2.9GHz vs 1.4GHz)
Intel Core i7 12700TE 's Advantages
Released 3 years 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 (25MB vs 9MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (35W vs 65W)