Intel Core i7 9800X 's Advantages
Larger memory bandwidth (79.47GB/s vs 41.6GB/s)
Higher base frequency (3.8GHz vs 3.1GHz)
Larger L3 cache size (17MB vs 16MB)
Intel Core i9 9900 's Advantages
Released 6 months late
Integrated graphics card
Lower TDP (65W vs 165W)