I have had my new computer for a bit over a month now, and I am still curious on this. I have an AMD Radeon HD 6670 GPU as my video card, and my CPU is the A8-3850 APU which has a 6550D GPU in it and it can crossfire with 3 different AMD GPU's, the 6670 being one. The problem I'm having is that my computer doesn't detect the 6550D. Only my 6670. I've read about this in places, and I've come to a conclusion where all I have to do is take out my 6670 so it is forced to use my integrated graphics, thus detecting it. I just want some clarification if I'm correct or not, because my friend is coming to my house to get it to crossfire at some point as well, but he said that I have to re-install Windows entirely for everything to work correctly. I just want to know if I'm right, or if he is right, or if we are both wrong and it's a whole different process entirely.