Resolved* PCIE x16 slot stuck at x1 mode while gaming

What are PCIe x1 Slots Used For?

Either the latch broke and not releasing or you need to try in install the GPU card until the gray latch pops up in the secure position and then

gpu blocking pcie slot First, turn off the computer and disconnect all cables Press down on the PCIe slot's retention lever to release it Next, gently but firmly

gpu with m2 slot First, turn off the computer and disconnect all cables Press down on the PCIe slot's retention lever to release it Next, gently but firmly