Z77 pro3 pcie problem

Card in Slot How will it work? - can i use pcie 3 0 in 2 0 slot Solution You can use any PCI device on newer PCIe slots PCIe slots are compatible with previous generation cards can i put ddr3 in ddr4 slot It's common for motherboards to have two x16 slots, but only one is wired to use 16 lanes and the other uses only 8 or 4 It is also

can you put a pcie x4 in a x16 slot You're referring to NVME based M2 SSDs, correct? But yes if the SSD is PCIE spec then of course the speed will be less when used on PCIE