Club 3D Radeon HD 7990 6GB - Overclocking

Given our success with overclocking the original Radeon HD 7970 3GB, we rather optimistically pushed the memory and core clock frequencies to the highest that MSI Afterburner would permit, and were thrilled when the card proved capable of running stable at these settings. The overclocks achieved were 1,125MHz on the core (a massive 21 per cent boost) and 1.575GHz (6.3GHz effective) for the memory (a 14 per cent jump). We also increased the card's power draw to 120%, again the maximum permitted, and the core voltage to 1,181mV.

By modifying the .cfg file of Afterburner, we were able to remove the limits imposed by the software on the clock speeds, but after attempting to push the card even a little further, it soon ran into stability problems. We therefore settled on the overclocks mentioned above, and repeated the Unigine Heaven benchmark as well as the three screen Battlefield 3 run to test the effects of the performance boost.



Read our performance analysis on the next page.