Question Problem getting video output in asus gaming strix motherboard

Sep 15, 2019
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hi
i have asus B360f gaming strix motherboard (cpu :Intel Core i3 - 7100 and 8GB of ram)and i install 2 video cards (2*Sapphire NITRO+ Radeon RX 580 4GB) on it (On PCI-Express16 Slots), the problem is that i can only get output video from motherboard (2 outputs DVI and HDMI) and from one video card (5 output) totally 7 outputs in the same time, the second video card has no output (if i remove the other video card this one will work fine and can present all output) but i need 12 outputs so where is the problem from? any help would be appreciated.