What case and how many fans? It will be important to have good airflow. With these components, you should be able to achieve your desired OC.
If I was using a Coolermaster HAF 912 Plus with all fan slots filled (2x200mm, 1x120mm, 1x140mm) would I be able to achieve that? Also as you seem very knowledgeable, I am struggling to grasp the 970 and 990... what is the difference? ty