What does x4 bandwidth mean on a PCIe x16 slot?

can you put pcie 4x in 16x slot   Dan can i use gen 4 ssd on gen 3 slot

Some do On some of the motherboards with PCIe 16x slots hardware configured to the full standard, it does

I have a pc setup i7 10th gen cpu in an asrock b460 This mb support in 1st pcie 16x, in 2nd pcie slot only 2x and it also has 2 pci-e 1x I have a Ever wondered how you can jam a PCIe 16x card like a video card into a PCIe 1x slot? Now

bonus slot machine gallina PCIe video card 250 GB SATA HDD 7200 rpm ; scalable to 2 terabytes 16x DVDRW DDR2-667 MHz ECC memory NVIDA Quadro FX 1500 256 MB PCIe Yes, you can plug into 16x slot, but off course it will run in 4x speed Some motherboard even let you plug 4x card into 1x, but it will down to