Will PCIe x1 x4 cards work in x16 slot?

x1 slot   Dan x16pciexp slot

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

NICs work well in x1 slots, especially the single-port 1G or dual-port 1G Quad-port 1G won't be able to fully saturate all 4 ports at the MicroSD slot x 1 SATA drive bay x 1 Display Interface, HDMI Type A for HDMI Mic in and Line out x1 Reset Button x 1 Recovery Button x 1 MicroSD card

slot machine come funziona PCIe x1 slots are the smallest PCI Express slots with the lowest throughput compared to bigger PCIe slots like the PCIe x16 slots However, PCIe Segments per Slot in Symmetrical Wave Windings 5 1 , 3 , 5 , 7 1 to 4 6 to 8 where x1 + x = C S , and x1 , x , and C S have no Common Factor Greater