PCIE x16 slot only running my RTX 3080 at x4 (8GTs

x16 slot   Dan x16pciexp slot

Yes, a x1 card should work in a x16 slot It's good that you've got it to work in a x1 slot What else have you tried it in besides the x16 slot

Slots CPU: - 1 x PCIe x16 Slot , supports x16 mode* - 1 x PCIe x16 Slot , supports x4 mode* Chipset: - 1 x PCIe x1 Slot * - slot will run at the lowest denomination speed The most common PCIe slot currently in use are PCIe x16 slots, PCIe x4 slots, and

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