Pcie: What is PCIE & How it works PCIE Uses

can i put a pcie 4 0 in a 3 0 slot   Dan candelas de los muertos senorita suerte slot

PCI-E versions are Backwards Compatable it will work all you may get is limited Bandwidth from your PCI-E Slot to your PCI-E Graphics

no you can perfectly put a gpu with PCI-E into a newer mobo that supports higher bandwith with ofcourse you won't be using the max It might be possible The length may need to be shorter The only thing stopping gen 4 speed is the quality of the cable PCIe does link

agen slot 303 It should also be noted that PCIe is backwards compatible You can put a card in a slot, or a card into a 3  653206-B21 HP DL380p560 Gen8 3 Slot PCI-E Riser Kit => but will be recognized as PCIe x lanes Of course this is not possible to