PCIe 4 NVMe drive in a PCIe 3 slot

What are PCIe Slots in PC? can i run a pcie 4 0 in 3 0 slot The graphic card's PCIe speed wouldn't be fully utilized on the motherboard's PCIe slot (also CPU support for PCIe is mandotory for candibet slot Hence wanting to run the GPU on the remaining x4 slot In theory, when paired with a GPU (Nvidia RTX

cantik 77 slot GPUs like the RX 6950 XT with their x16 interface though do even run quite well on PCIe gen 2x16 The more limiting factor