Which Slot, out of PCIe x2, x4, x8 or x16 slot of Computer Mother

Still only shows x4 2 In the bios under AdvancedSystem Agent ConfigNB PCIe Config, changed both cards from Auto to Gen 3 Still only shows x4 3

PCI Express PCIe x4 slot

x4 slot They include hot-swappable SATA 6 Gbps HDDSSD, dual RJ45 LAN ports, a PCIe Gen 3 x4 slot, and two USB Gen 1 (5

slot online singapore slot with x4 PCIe Gen3 Key M slot with x2 PCIe Gen3 Key E slot, 1 x4 + 3 x1 USB*, USB Type-C connector: 2x USB