For that you need a smart fan controller like thishttps://www.nzxt.com/products/grid-plus-v2
It can control each fan based off what ever conditions you set.
Otherwise, save your money,and crank them to full in the BIOS. lol. That or set a fan curve so they even a mild CPU temp increases the fan speed. I assume your GPU is getting hot during gaming which means your CPU has to be used even a bit and will increase in temps.