Intel Core i9 9960X 's Advantages
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (85GB/s vs 37.5GB/s)
Larger L3 cache size (22MB vs 8MB)
Intel Core i3 9300 's Advantages
Released 6 months late
Integrated graphics card
Higher base frequency (3.7GHz vs 3.1GHz)
Lower TDP (62W vs 165W)