Is it okay to put Gen 3 SSD in my motherboards Gen 4 pcie slots?

Yes, PCIe is both forwards and backwards compatible For example, this gen 4 NVMe SSD will work in a gen 3 PCIe slot, and a gen 3 NVMe SSD would also work

This is running off a chipset fed PCIe NVME slot on the X570 Aorus Xtreme, I understand it's not going to be as fast as a CPU provided NVME

genies touch slot gen 3 Those sort of face-melting speeds pair nicely with supercharged NVMe drives Both the PCIe lanes in your motherboard and the slot

gengtoto slot The WD Black SN850X is something of a last hurrah for Gen 4 SSDs, and it's still the best overall NVMe drive out there right now Read more