Intel Core i9 9900X 's Advantages
Higher base frequency (3.5GHz vs 2.7GHz)
Lower TDP (165W vs 280W)
AMD Ryzen Threadripper Pro 3995WX 's Advantages
Released 1 years and 9 months late
Higher specification of memory (3200 vs 2666)
Larger memory bandwidth (204.8GB/s vs 85GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (256MB vs 20MB)
More modern manufacturing process (7nm vs 14nm)