pcie card to mb compatibility

I have an "ASUSTek COMPUTER INC. PRIME H270-PLUS" MB (as shown exactly from CPU-Z). https://www.asus.com/media/global/gallery/Hgka8kXr8v8N6rA2_setting_xxx_0_90_end_1000.png The board has these slots: one PCIe x16 used for an ASUS GTX1080 ROG STRX video card one PCIe x4 used for another...