Attempts to coax extra frequency out of the already-overclocked card met with resistance. Try as we might, the GPU refused to run much past 911MHz core and 5,212MHz memory. In fact, it would sporadically crash at these frequencies, suggesting that there's not a great deal of headroom in the part.
We'll investigate the issue further in a separate article, but for now, here's how the HD 6990 OC+ fared in Aliens vs. Predator and Just Cause 2 at 2,560x1,600.
Every little helps, right?