Hi, I try this, help a bit by settings to low but won't solve.
AMD Catalyst Control Center
This help best
1. Go to Power tab, under PowerPlay. Switchable Graphics Global Settings, Untick "Allow additional power-savings".
Additional you can do.
2. Go to Gaming. Under 3D Application Settings(High Performance Graphics). I'm assuming your game should have high requirements.
Main idea is to change as low as possible
Anti-Aliasing Mode: Override application settings
Anti-Aliasing Samples: None
Anisotropic Filtering Mode: Override application settings
Anisotropic Filtering Level: 2x
Frame Rate Control
Wait for Vertical Refresh: On, unless application specifies
Tesselation Mode: Override application settings
Maximum Tesselation Level: 2x