1050ti GPU only lines up with pcie x4 slot - what will happen?

My mobo manual says that the x16 slot is for a GPU, but more googling has revealed that others have plugged a x1 raid controller in the slot

Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

fruitopolis slot By you sticking a UAD-2 card into the second slot, the motherboard detects this and automatically throttles the first slot down to 8x assuming you have stuck in

play legacy of dead slot In terms of storage, the NUC 14 Pro+ features one 2280 PCIe Gen4x4 NVMe SSD slot and one 2242 PCIe x4 NVMe SSD slot NUC 14 Pro+