I bought the A8 6600K thinking that I could crossfire it with my 6870, but upon more research, apparently you can't. I thought that if you could crossfire it with the 6670 and the 7750, you should be able to crossfire with the 6870 as well. Please help by telling me if you can or not. I have already opened the APU, but I think that I can return it, as I have not installed it yet.