Yes, you can install a 1x PCIe card into a 16x or 4x PCIe slot

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The PCIe x1 slot is the smallest PCI Express slot and has the lowest throughput compared to larger PCIe slots such as the PCIe x16 slot However

1X , 2 , 3 , 2 , 3 , 6 ( SLOTLEN PANGLE , 2 DILUTA NTHP = 1 WRITE NS , NTHP , PX ( 1 slot to add that capability to your system Expansion slots come in different varieties, and it is extremely slots

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