can i use pcie 3.0 ssd in 4.0 slot

AMBIL SEKARANG

M.2 4x4 NVMe SSD Silent PCIe Card - Sonnet - SONNETTECH

My first M.2 slot is already taken by the main SSD, which i use for the OS and other stuff, i can't really use it. Will a PCIe x4 SSD work on a PCIe x2 slot.

Can I Use a PCIe 4.0 Graphics Card in a PCIe 3.0 Slot? - TechReviewer

Learn whether PCIe 4.0 graphics cards will work in PCIe 3.0 motherboard slots. ... A PCIe 4.0 graphics card will work in a PCIe 3.0 motherboard slot at PCIe 3.0 speeds.

Will PCIe 3.0 x4 10Gbe NIC Work in PCIe 3.0x1 Bandwidth?

I tested PCIe 3.0 x4 10Gbe NIC in a PCIe 3.0 x1 slot, and here's my thoughts and results. ... Therefore, can you use a PCIe 3.0 x4 10Gbe NIC in a PCIe 3.0 x1 slot.