Intel Core i7 7700K 's Advantages
Better graphics card performance
Higher base frequency (4.2GHz vs 3.7GHz)
Intel Core i3 9300 's Advantages
Released 2 years and 3 months late
Higher specification of memory (DDR4-2400 vs DDR4-2400)
Larger memory bandwidth (37.5GB/s vs 35.76GB/s)
Lower TDP (62W vs 91W)