Sanal: Crossfire is a much more open standard, it only requires that the slots run at x4 speeds. There's no certification process or anything, if you board has more one x16-sized slot, then it supports Crossfire
SLI is a bit different, the slots must be x8 speed or better, and the board must be certified by Nvidia, meaning that the manufacturer of the board needs to pay a royalty. This means that having more than one PCI-E x16 slot is not a guarantee that the board is SLI-compliant.
Also in should be mentioned that the pairing of a discrete GPU and an APU is not called Crossfire, it's called Dual Graphics.
Does it have two slots for video cards? Some AMD boards might just support Crossfire between an APU and a GPU.
It'll usually say on the specs of the motherboard.
Also be aware, some cheaper end boards that support crossfire and sli actually slow down the cards when they do it. Make sure to get a good one.
Generally using two cards is more expensive than just getting one faster card, unless you're going for VR or 4K gaming.
Well you wouldn't be able to use CrossFire as that is only for AMD cards. You would use SLI. If your motherboard came with an SLI bridge, then it supports it. Look at the manual for exact information.
and the motherboard make and model is ?????