Intel Core i7 6700T 's Advantages
Lower TDP (35W vs 65W)
Intel Core i5 9400 's Advantages
Released 3 years and 4 months late
Higher specification of memory (2666 vs 2133)
Larger memory bandwidth (41.6GB/s vs 34.1GB/s)
Newer PCIe version (3.0 vs 3)
Higher base frequency (2.9GHz vs 2.8GHz)
Larger L3 cache size (9MB vs 8MB)