Hi, I have recently had a computer built for me with the AMD A10 5800K APU. Not knowing the limits of the dual graphics/crossfire compatibility, I installed a XFX radeon 6850 GPU. So now the APU's graphics are disabled and I'm only using the GPU because they are not compatiable. The latest GPU that is compatible with my processor is the Radeon 6670. So i'm wondering which would perform better for gaming, one XFX 6850 or my APU + Radeon 6670 dual graphics/crossfire. Thanks!