crossfire, dual graphics, ect many names...
This was always something determined driver/software level by AMD at least, wasn't typically something programmed in...
IE I did crossfire with my A10-6800k, A10-7850k, and A10-7890k with both "approved" and even those not listed, of course, returns on investment (increased price/performance) where ABSOLUTE SHIT! and I only did it because I got one or more parts for free and hey, an improvement is an improvement!!!
That being said, I am wondering if the new Ryzen APU's can MultiGPU for DX12 titles, in which case, THATS SEXY AND I WANT (even though I have a 1600x)