Intel Core i5 8400 's Advantages
Integrated graphics card
Lower TDP (65W vs 280W)
AMD Ryzen Threadripper PRO 5975WX 's Advantages
Released 4 years and 5 months late
Higher specification of memory (DDR4-3200 vs DDR4-2666)
Newer PCIe version (4 vs 3.0)
Higher base frequency (3.6GHz vs 2.8GHz)
Larger L3 cache size (128MB vs 9MB)