Intel Core i9 10900X 's Advantages
Larger memory bandwidth (93.8GB/s vs 76.8GB/s)
Higher base frequency (3.7GHz vs 2.4GHz)
Intel Core i9 12900 's Advantages
Released 2 years and 3 months late
Higher specification of memory (4800 vs 2933)
Newer PCIe version (5 vs 3.0)
Larger L3 cache size (30MB vs 20MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (65W vs 165W)