I have a Lenovo PC that came with an integrated Radeon 8670D. I also bought a Radeon 6450 card and installed that. Both have up-to-date drivers.
Running the FFXIV:ARR benchmark on medium & fullscreen, I got a benchmark score of 3668. I confirmed in the Catalyst Control Center that the 8670D was the enabled driver.
I then turned on Dual Graphics and confirmed this in dxdiag. I ran the benchmark again, same settings. I then got a lower score of 3594...
What's wrong? How can I fix this?