I have just added a GTX 1070 to my existing 970 but I'm a little concerned about the reported temperatures. GPU-Z is saying the the 1070 is 81 deg.C and the 970 is close to that temperature. That is not during a render but I do have IRay preview running in the viewport.
I have a liquid cooler with radiator for the CPU and two other case fans. The 1070 is an Asus Turbo and the 970 is an Asus Strix. I've read that these do tend to run hot but there is advice to manually adjust the fan speed in the NVidia Control Panel. However, the NVidia Control Panel does not contain the Performance menu shown in the instructions. Someone suggested that it only appears if the motherboard is an NVidia. According to the hardware report, the fans are only reaching 50% of their maximum speed so there's room for a little more agressive cooling, it seems to me.
Any ideas how I can increase the fan speed or is 80 deg normal?