Pcie Lanes Connectx-3 NIC question

PCIe Vs PCIe : Which Is Better For SSDs? can i run a pcie 4 0 in 3 0 slot Due to the forward and backward compatibility, a PCIe GPU will perform like a PCIe GPU card if connected to a PCIe (or in the future can you use pcie 40 gpu in 30 slot If you can, will it run at least as it did in the older PCIe x 16 slot? Most games use 4 cores anyway 13700k p57r48 HT off

can you put a pcie x1 in a x16 slot Yes, PCIe standards are thankfully backwards compatible, meaning that a PCIe device will work in a PCIe slot, but it will only be able to reach PCIe