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Lets say a motherboard has 1 PCI slot, is it sharing any bandwidth at all with the PCIe slots? I know PCIe slots have their own dedicated lanes.
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PRIME H610M5-TF-CSM. Intel® H610 micro-ATX motherboard (LGA 1700) with 4 x DDR5 DIMM slots and 2 x DDR4 DIMM slots, PCIe 4.0, M.2 slots, 1Gb Ethernet ...
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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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Similar to the PCIe expansion slots of your motherboard, the number of PCIe M.2 slots it will offer also depends on the number of PCIe lanes your motherboard supports.