what seems to be the problem? is your GPU getting very hot while playing certain games? i have a GTX 770 2GB and i have been playing battlefield 4 in ultra settings.. my fan has been at about 69 - 72% while the temperature has been around 69C. if you go to setting in ASI Afterburner, you can can click on the fan button and click on the enable user automatic fan button.. from there you can actually press the force fan speed update on each period. it will make your fan go faster, give it a try. But if your temperatures are low enough.. then i would not bother touching it.