AMD Ryzen 9 3900X 's Advantages
Higher base frequency (3.8GHz vs 3.7GHz)
Larger L3 cache size (64MB vs 20MB)
Lower TDP (105W vs 125W)
Intel Core i5 12600K 's Advantages
Released 2 years and 3 months late
Integrated graphics card
Higher specification of memory (DDR5-4800 vs DDR4-3200)
Larger memory bandwidth (76.8GB/s vs 47.68GB/s)
Newer PCIe version (5.0 vs 4.0)