The Radeon HD 7870 has a huige amount of freedom to overclock and the AMD overdrive settings are not at all too limited (opposed to the R7850). Overclocking tools - now you can use a 3rd party tool like AfterBurner, however without voltage tweaking we recommend you to stick to the AMD Overdrive functionality from within the AMD Catalyst drivers. So make sure your PC casing is well ventilated with decent airflow. That backside of your graphics card however gets hot as well, give it some airflow as well. Cooling helps a lot for overclocking, it's as simple as that. If you are willing to allow for more noise, increase the fan RPM on the GPU towards a higher setting that you find comfortable. Related to heat is your graphics card cooling system. Once you get artifacts or a lockup, back down 25 or preferably 50 MHz and typically that is your stable result in it's highest threshold - under the condition that the room temperature is the same (yes heat and surrounding heat have an influence on your overclock). In the first stage you overclock your GPU, in the second the memory. First off let us remind you that we recommend increments of 25 MHz on core and memory (from the default base clock frequency upwards). When you want to overclock a graphics card typically you need to verify and stabilize your tested settings.
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