AMD Ryzen 5 3400G 's Advantages
Integrated graphics card
Higher base frequency (3.7GHz vs 3.6GHz)
Lower TDP (45W vs 65W)
AMD Ryzen 3 3100 's Advantages
Released 9 months late
Higher specification of memory (DDR4-3200 vs DDR4-2933)
Larger memory bandwidth (51.2GB/s vs 43.71GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (16MB vs 4MB)
More modern manufacturing process (7nm vs 12nm)