I have hp pavilion g7 2205sr laptop with a10-4600m/7660g+7670m/win8
I always play skyrim using only 7670m, because crossfire makes game stutter heavily, while single card provides very smooth framerate.
After updating to embedded 13.9, i cant disable crossfire for Skyrim, because it results in dreadful lags.
It looks like videocard skips odd frames, driver thinks that crossfire is turned on, even if i force Skyrim to use 7670m only.
Sorry for my awful english.