PCI-Express 16x Graphics Adapter into PCI-E 8x Slot

What does x4 bandwidth mean on a PCIe x16 slot? can you put pcie 4x in 16x slot That particular SSD card is only able to use 4x PCIe lanes so putting it in a 16x lane slot would make no difference at all In fact all but one can i use pcie 40 in 50 slot If you have limited expansion slots on your motherboard and all you have available is an

candy pop 2 slot Pcie 4x slot vs pcie 16x slot Will it impact gpu performance when inserted in