Single Channel vs Dual Channel (How Bad is it?)

Single Channel RAM vs Dual Channel, How Bad is Single Channel?? i7-8700K @ RTX 2070 / 1080p High RAM1: 16 GB (1x16) DDR4 3400 MHz CL16 RAM2: 16 GB (2x8) DDR4 3400 MHz CL16 Win 10 latest Updates Games: 1-Far Cry New Dawn 2-Metro Exodus 3-Assassins Creed Odyssey 4-Battlefield V 5-Shadow of the Tomb Raider