Will PCIe x1 x4 cards work in x16 slot?

I explain in this video what devices PCIe x1 slots are used for on a motherboard I also attempt

2 Answers 2 Any PCI Express card of a smaller size will fit into a larger slot So an x1 card will fit in an x8 slot Please see the Wikipedia

x1 slot This is the trunk, says the BMW X1 Let's see how much fits in the trunk This much would be all six bags from my standard luggage test

x16 slot PCIe interface, slot and mounting multiple cards in one computer Computer motherboard may have PCIe slots compatible with x1, x4, x8 and x16 When users need