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.
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What are PCIe x1 Slots Used For? | 8 PCIe Devices for x1 Slots ...
The PCIe expansion cards get attached to PCIe slots found on the motherboard and thus add functionality such as video graphic processing, network capability, storage expansion, and more.