best fan configuration

Hi, Right now I am running a 11gb 1080ti Duke that runs about 70c on load. The CPU running at 4.9Ghz and is 30c idle and can get up to high 69-70 on load when gaming. I only have 2 fans in my computer. Both are 120mm and one is in the front and one is in the rear. The one in the rear is exhaust...