AMD Ryzen 9 5900 's Advantages
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (3.0GHz vs 2.7GHz)
Larger L3 cache size (32MB vs 8MB)
AMD Ryzen 3 5425U 's Advantages
Released 1 years late
Integrated graphics card
Higher specification of memory (LPDDR4x-4267 vs DDR4-3200)
Lower TDP (10W vs 65W)