Intel Core i9 9900K Advantages
Released 2 years and 5 months late
Integrated graphics card
Higher specification of memory (2666 vs 2133)
Higher base frequency (3.6GHz vs 3.2GHz)
Lower TDP (95W vs 140W)
Intel Core i7 6900K Advantages
Larger memory bandwidth (76.8GB/s vs 41.6GB/s)
Larger L3 cache size (20MB vs 16MB)