Intel Core i9 9900T 's Advantages
Integrated graphics card
Lower TDP (35W vs 165W)
Intel Core i9 10920X 's Advantages
Released 6 months late
Higher specification of memory (2933 vs 2666)
Larger memory bandwidth (93.8GB/s vs 41.6GB/s)
Higher base frequency (3.5GHz vs 2.1GHz)
Larger L3 cache size (20MB vs 16MB)