Hi
I have an APU 7860K with IGP Radeon R7 and a PCI Radeon R7 250 GDDR3 (OLAND),
I have tried with different versions of drivers from Catalyst to Crimson, also those that come in the Cd of the motherboard, but dual graphics does not work, the option is available but only works the selected GPU.
How do I know what is compatible? Because a while ago with crimson drivers 17.1.1 I could activate it, in video games, emulators, or software HW info was Radeon R7 250 + Radeon R7..
Then came an update and I lost the DUAL GRAPHICS 
The only time I ran dual graphics I had 3 slots of RAM 1X8GB - 2X4GB BOTH 1666mhz
I hope you can help me, since I do not remember that it was exactly how I got it activated.
Consider:
-My motherboard is compatible with dual graphics.
-My ram is dual channels. I tried with 1 slot of 8GB and 2x4gb (1666mhz) and there are no changes.
- I tried to change the main NB / SB / IGP in Bios and it still does not work.
- I have tried with DDU, AMD CLEAN UTILITY, SAFE MODE, formatting OS.
The only time I ran dual graphics I had 3 slots of RAM 1X8GB - 2X4GB BOTH 1666mhz
MY SPECS:
