New PC that still has a PCI slot

Using a PCIe x1 card in a PCIe x16 slot pci 1 slot If there is more than one GPU or lane occupied on the motherboard, the second PCI lane, when used in conjunction with the first, brings the PCI pcie training error slot 1 For example, my NIC is a ConnectX3 single port which is a x4 card That's not going to fit in a 1x slot

pcie 4 in pcie 3 slot List of Motherboards with 1 PCI-Express x16 Slots: ASRock B760M-H, ASRock H610MAC, ASRock B760M-HDV, ASRock H610M-HDV+ D5, GIGABYTE B650M D3HP,