Intel Core i9 10900X 's Advantages
Higher specification of memory (DDR4-2933 vs DDR4-2666)
Larger memory bandwidth (93.8GB/s vs 41.6GB/s)
Larger L3 cache size (20MB vs 8MB)
Intel Core i3 10300 's Advantages
Released 7 months late
Integrated graphics card
Lower TDP (65W vs 165W)