I use CoreCtrl to fix my GPU's atrocious fan curve, which is a necessity since normally it overheats to high hell. With CoreCtrl, I have a nice fan curve that makes my GPU rarely, if ever, run hotter than 70°C.
I wish it had Nvidia support. Even though I have it installed, it’s useless for me. Currently trying to find a fan control/curve tool/program that works with Nvidia GPU.