What is the purpose of the PCIe X1 slot

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Would a RAID card require cooling if I disconnect the expansion slot cover and use standoffs to mount it to the back of the case?

pcie m2 slot A PCIe x16 slot is a type of expansion slot on a computer's motherboard that provides 16 lanes of PCIe connectivity It is designed to support high-performance

pcie cem slot A Small PC with open PCIe x4 expansion slot · Powerful Intel Core i7 Mobile Processor · PCIe Slot