Yes, you can install a 1x PCIe card into a 16x or 4x PCIe slot

What Is PCIe x16 ? - can you put a pcie x1 in a x16 slot NI PCIe 6612 has x1 Form Factor and maximum bandwidth for x1 configuration is 250MBs It doesn't change if you put x1 card in x2, x4, candy mix slot So, to answer your original question, if you're happy to abandon any other PCI devices you currently have, you can choose a motherboard with more PCIe x1 slots;

can you use pcie 40 gpu in 30 slot This PCIe x1 to PCIe x16 Slot Extension adapter provides enhanced compatibility between motherboards and a variety of PCI-Express expansion cards, allowing you