Intel Core i5 6400 's Advantages
Integrated graphics card
Intel Processor 300T 's Advantages
Released 8 years and 4 months late
Higher specification of memory (DDR5-4800 vs DDR4-2133)
Larger memory bandwidth (76.8GB/s vs 34.1GB/s)
Newer PCIe version (5 vs 3.0)
Higher base frequency (3.4GHz vs 2.7GHz)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (35W vs 65W)