micro procesador apu a10 7860k
memoria ram 24 gb 2133 mhz
I was mentioned to put a 4g r7 370 graphics card or radeon rx 460
This is a 6 year old article from a tech site about which GPU card is compatible with your APU for Dual Graphics: [UPDATE] AMD Kaveri Dual Graphics Only Works With Radeon R7 250 and Radeon R7 240 GPUs
From CPU World about Dual Graphics compatibility for all AMD APUs: http://www.cpu-world.com/info/AMD/Recommended_graphics_cards_for_AMD_dual-graphics.html
At that time only two GPU are compatible R7-250 and R7-240 GPU will work in Dual Graphics with your A10 Kaveri Processor.
I wold not recommend crossfire at all. You would be wasting your time and money unless you are getting the card for free. Support in the last few years in the drivers and in games is pretty much non existent. Crossfire is discontinued after DX11 and replaced by Multi GPU in DX 12 and less than a handful of games support it. You would be far better off if spending money to put that money toward a single card solution that meets your needs.
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