Intel Core i9 9900K's Advantages
Integrated graphics card
Higher base frequency (3.6GHz vs 3.0GHz)
Lower TDP (95W vs 250W)
AMD Ryzen Threadripper 2990WX's Advantages
Higher specification of memory (DDR4-2933 vs DDR4-2666)
Larger memory bandwidth (87.42GB/s vs 41.6GB/s)
Larger L3 cache size (64MB vs 16MB)