Can You Use a PCIe Express 3.0 Card In a 2.0 Slot?
To add more PCIe slots, you would need to upgrade to a motherboard with more PCIe lanes. It’s not possible to add more PCIe slots without replacing the motherboard.
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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.
ASUS ROG Strix Z790-F Gaming WiFi II LGA 1700(Intel 14th &13th ...
Upgrade your workstation with the ASUS Pro WS W790-ACE CEB Motherboard. Featuring 5x PCIe 5.0x16 slots, M.2 PCIe 4.0 slots, and support for DDR5 R-DIMM memory, this motherboard delivers exceptional performance and speed.
4 PCI-Express x16 Slots Motherboard | Pangoly
BTC-T37 GPU Mining Rig Machine Motherboard With CPU support 8 GPU PCIE slots USA.