I play on 4k, and most games I get 60-70 fps on ultra with My 980TI, Also I found this on a older post in the LTT:
You can view a list of pre-defined crossfire profiles within catalyst control center.
Start by opening catalyst control center, using advanced view navigate to the gaming tab then select "3D Application Settings"
From here, select "Add..." choose any .exe or file (in this example I used an mp4), preferably not a game unless you want to make a game specific profile.
Select your newly added entry. At the bottom, under "AMD CrossFireX Mode" change "default" to "Use AMD pre-defined profile"
This will give you both a search bar, and a small window to scroll through every pre-defined profile. After you're done, feel free to delete the test profile so it doesn't accidentally interfere with regular use.
Crossfire support is not limited to pre-defined profiles. Crossfire will "work" in nearly every game. Manual changes to crossfire mode can improve/change experiences if needed. Only games with compatibility issues or in need of tweaks tend to get specific pre-defined profiles made for them.