Intel Core i9 12900E 's Advantages
Released 2 years and 9 months late
Higher specification of memory (4800 vs 2666)
Larger memory bandwidth (76.8GB/s vs 41.6GB/s)
Newer PCIe version (5 vs 3.0)
Larger L3 cache size (30MB vs 16MB)
More modern manufacturing process (10nm vs 14nm)
Lower TDP (35W vs 65W)
Intel Core i9 9900 's Advantages
Higher base frequency (3.1GHz vs 2.3GHz)