Intel Core i5 6400 's Advantages
Integrated graphics card
Lower TDP (65W vs 250W)
AMD Ryzen Threadripper 2990WX 's Advantages
Released 2 years and 11 months late
Higher specification of memory (DDR4-2933 vs DDR4-2133)
Larger memory bandwidth (87.42GB/s vs 34.1GB/s)
Higher base frequency (3.0GHz vs 2.7GHz)
Larger L3 cache size (64MB vs 6MB)