Intel Core i5 9400 's Advantages
Integrated graphics card
Lower TDP (65W vs 180W)
AMD Ryzen Threadripper 2950X 's Advantages
Higher specification of memory (2933 vs 2666)
Larger memory bandwidth (87.42GB/s vs 41.6GB/s)
Higher base frequency (3.5GHz vs 2.9GHz)
Larger L3 cache size (32MB vs 9MB)
More modern manufacturing process (12nm vs 14nm)