Upgrade Your System with High-Performance motherboard 4 pcie x16 ...
The latest motherboard 4 pcie x16 slots boards feature PCIe slots for graphics cards in addition to M.2 slots for SSDs and multiple I/O ports for peripherals.
Can I Use a PCIe 4.0 Graphics Card in a PCIe 3.0 Slot? - TechReviewer
Learn whether PCIe 4.0 graphics cards will work in PCIe 3.0 motherboard slots. ... A PCIe 4.0 graphics card will work in a PCIe 3.0 motherboard slot at PCIe 3.0 speeds.
Add more PCIe slots to your mining motherboard - YouTube
If you need more PCIe slots, you will need to replace your motherboard with one that has more slots.