Does the PCI-e x1 Sound Card fit in PCI-e x16 Slot?

can you put pcie 1x in 16x slot   Dan can i put a gen 4 m2 in a gen 3 slot

If you have a vertical GPU slot in your case then try a riser cable, you'll find some that go from 1x plug to 16x slot You can also find →

+1 Also cards must support being inserted into a smaller slot than they're designed for Some slots x1 slot and what PCIe lanes are is a very important consideration so that you can install

jul-955 Up to 9x slots can be PCIe ; Supports a RAIDHBA in CFF form factor PCIe x16 full-height half-length slots, plus 1x OCP slot Internal: For It is not easy to get a powerful graphics card in a rack server Therefore, I bought two of these 1X