can i use m.2 pcie 4.0 in 3.0 slot
Can I Use a PCIe 4.0 Graphics Card in a PCIe 3.0 Slot? - TechReviewer
For example, a PCIe 3.0 x4 SSD card can fit in a PCIe 4.0 x4 or x8 slot, but a PCIe 3.0 x8 card won’t be compatible with an x2 or x4 slot.
Joint Tactical Information Distribution System - Wikipedia
PCIe 4.0 SSDs can only match the speeds of a PCIe 4.0 slot, and PCIe 3.0 SSDs can't leap in data transfer rate and bandwidth to PCIe 4.0.
PCI-Express 4.0 là gì? Những điều cần biết về PCIe 4.0
Can I Use a PCIe 3.0 Graphics Card in a PCIe 4.0 Slot?