Recently I bought a 7990 because of the amazing deal, and it's great, except in some games, one of those being BF3. I play BF3 a lot, so this is a problem for me. When playing BF3, both GPUs will be running at 50-60%, basically the equivalent of a single 7970. At Ultra settings, the game plays sluggish at times, which is unnacceptable for a 7990. The other thing is, if I turn down the settings to low, BF3 starts using an even lower percentage of the GPUs, pretty much throttling the GPUs depending on the graphics settings. I would think that this is a driver issue, but other people have reported full GPU usage in BF3 with a 7990, getting >100 FPS, while I only get 50 FPS average with the same drivers (13.8 beta).
I've tried a number of fixes, like making my own BF3 profile in CCC and tinkering with settings, setting ULPS to 0 in regedit, using different crossfire modes, and turning the power to +20 for both GPUs, all with no avail.
On most other games, though, it's fine. Crysis 3, for example, uses both GPUs at >90% all the time. In Bioshock infinite the usage percentage jumps from 60% to 99% a lot, but the framerate is stable, always at >100 FPS.
Anyway, I was hoping someone on here might know the solution for my problem. Any and all help is appreciated!