Best motherboard for the Ryzen 7 7800X3D in 2024 - XDA
ASROCK limits the motherboard with two PCIe x16 slots (PCIe 5.0 x16 supporting up to x16 mode and PCIe 4.0 x16 slot supporting x4 mode) and one PCIe 3.0 x1 slot at the end.
Everything You Need to Know About PCIe 4.0
Can I Use a PCIe 4.0 Graphics Card in a PCIe 3.0 Motherboard Slot? ... You can use PCIe cards of a lower lane width (e.g., x2, x4, or x8) in a higher lane width slot (e.g., x16).
PCIE 3.0 x1 SATA cards - Storage Devices and Controllers - Unraid
Asus TUF GAMING B660M-PLUS WIFI D4 FCLGA1200 ATX Motherboard : 1 x DDR4 Slot, 2 x PCIe 3.0 x16 Slots, 2 x PCIe x1 Slots, 2 x PCIe x4 Slots, 1 x PCIe x16 Slot, 4 x SATA III Slots 7.1-Channel Audio.