Which PCIe slot is to be used

However, the 2nd PCIe x16 slot works at PCIe x4 if two GPU are connected means the primary PCIe x16 slot gets 16 lanes and I still have 4 lanes

Hi Can someone help me understand what PCIe x4 Slot means?

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slot gemes The PCIEX1_2 slot will become unavailable when a PCIe x4 expansion card is installed * When installing a x8 or above card in the PCIEX4 slot,