We do need to warn you, increasing GPU voltages remains more dangerous. The latest beta of AfterBurner supports voltages up-to 1.3 Volts on the GPU, that's enough to fool and fiddle with. If you like to go a little more extreme, you can opt to voltage tweak the graphics processor. By increasing the power slider towards 20% you increase the board TDP 140(W) x 1.20(MP) towards 175 Watt, this gives you more overclocking headroom as the card may now deliver more power throughout the board.įor the default overclock we ended at 1100 MHz on the GPU core and 1450 (x4 quad data rate)=5800 MHz on the memory.

The maximum board power roughly 75 Watt however the 7870 is configured at a 140W TDP.

The lowest slider 'power control' slider is important, your 7870 is limited and tied to the cards maximum board power.

Memory is quad data rate hence you get an effective 5800 Gbps effective. Set 1450 MHz on the memory (1200 =default). Set the GPU clock at 1100 MHz on the core (1000 = default) The three variables you need to coop with are GPU clock, memory clock and power control settings.īut without a voltage tweak, our card is stable up-to roughly 1100 MHz. 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.

Msi amd radeon hd 7800