PCIe x4 vs x16 for single NVMe SSD speed increase?

can you put pcie 4x in 16x slot   Dan candy bar slot

Thanks everyone It worked just fine to use the 4x slot B

I would like to be able to put a graphics card in the 16x slot and use the riser card in the 4x slot, but it seems as if that might be If you want to put a PCIe x16 card on a PCIe 1x slot throught some converter, you need to add power

bonanza gold slot PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 You can find these platforms in the FG2 rugged servers and are available today  Depends on the case and where your PSU is if putting the GPU in the bottom PCIE slot it might reduce airflow to the GPU with it being to close