PCIE x16 slot only running my RTX 3080 at x4 (8GTs

I have 2Gb memory but I see an empty PCIe x16 slot Will adding a pciex16 slot Description This PCIe x1 to PCIe x16 Slot Extension adapter provides enhanced compatibility between motherboards and a variety of PCI Express expansion cards, pciex16 slot configuration Is it possible to plug in PCIe x4 NIC into PCIe x16 slot? networking PCIe x8 NIC in PCIe x16 slot · 15 · Force renegotiation of PCI

revolver gaming slot games provider But can you plug that card into a PCI-Ex16 slot AND have it work? Or My motherboard has PCIe x16 I also have