Most of the FM2 boards should support hybrid crossfire/ dual graphics. You would need a specific graphics card (HD 6670 recommended http://www.amd.com/us/products/technologies/dual-graphics/Pages/dual-graphics.aspx#3 )
However, from AMD:
"With AMD Radeon™ Dual Graphics, full enablement of all discrete graphics video and display features may not be supported on all systems and may depend on the master device to which the display is connected. Check with your component or system manufacturer for specific mode capabilities and supported technologies".
If decided about a board, check the board's manual firstly and see if dual grahics is supported.