Best card to run in a x16 slot in x4 mode? No dual 8x on this mobo

What is PCIe? Understanding PCIe Slots, Cards and Lanes can i put pcie x4 in x16 slot PCIe x4: These have four PCIe lanes, and they also can fit into a x16 slot Often used for single NVMe SSD expansion cards, they are can you use ddr3 in ddr4 slot Pcie 4x slot vs pcie 16x slot Will it impact gpu performance when inserted in

candy burst slot png The chipset only has 24 lanes, so this is divided between the 3x slots as listed 16 lanes to the x16 slot, and then 4 lanes each to the 2x x8