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yea you should only have one version of the driver on there for both cards. I think it would be safest to just use what came with their disc, and make sure there is nothing hooked up to the HD6670 while trying to set up crossfire. (i'm thinking when you used the catalyst drivers for the HD6670 its probably using those for the APU as well since they're newer, it really shouldn't matter...) Load gpu-z and see if it lists the same driver version for both GPUs.
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