Intel Core i9 9900K 's Advantages
Higher base frequency (3.6GHz vs 2.5GHz)
Lower TDP (95W vs 125W)
Intel Core Ultra 9 285 's Advantages
Released 6 years late
Better graphics card performance
Higher specification of memory (5600 vs 2666)
Larger memory bandwidth (102.4GB/s vs 41.6GB/s)
Newer PCIe version (5 vs 3.0)
Larger L3 cache size (36MB vs 16MB)
More modern manufacturing process (7nm vs 14nm)