I was over clocking my gpu(AMD Radeon R9 270), and its temp with no overclocking on the benchmark was about 65. I don't know if you are familiar with LinusTechTips. But he did a review of my gpu and he said a to get a good overclock just move all the sliders to the max.I over clocked it like that and the benchmark temperature was 75. I am getting another fan for my case in a few days. I just wanted to know if that was a decently stable temperature? However my gpu temperature at idle is 45.