AMD Radeon 6990 4GB Graphics Card Review

Overclocking
The 6990 features the awesome switch or AUSUM if you want to be technical and increase the cards speed to a pre-defined overclock but we are looking for a bit more.

The card runs at a stock 830MHz and 1250MHz for the memory. The AUSUM switch pushes this to 880MHz and keeps the memory at 1250MHz

To find the maximum overclock, we used MSI Afterburner to increase the clock speeds by 10MHz at a time, whilst relying on GPU-Z for clarification of the speeds and Furmark to test stability.

The results that we obtain can only be used as a guideline as to what this range of cards can do. Obviously every card has a different core among other vital parts, and therefore each card will give slightly varied results.

The overclocks we obtained were fully stable at 910MHz GPU clock and 1540MHz memory clock, which from the stock 830MHz is quite a nice increase, though our original Sapphire card managed a 960MHz on the GPU clock. We were able to push the memory on this card a bit further than the Sapphire card that we looked at a few weeks ago.

Be warned though, as we overclocked this card, the power draw increased, thus more heat was generated and the fan really did sound like it was ready for an inflight battle.