This system features 2 EVGA GTX 780 Classifieds. The heart of this system is the Asus Rampage IV Black Edition paired with Intel's i7-4930k cpu. These fans are not controlled by a fan controller, so they run at 1,400 rpm and are slightly audible. I could have run the fans at 5 volts which would have been around 600 rpm making them much quieter. However, there would be a noticeable difference in temperatures during long periods of heavy use.