Is My Intel® NUC Compatible With an NVMe Drive?

can i use gen 4 nvme in gen 3 slot   Dan candy village slot

Yes It's backward compatible It'll work as a device even though it would be capable of working in a slot It will work

Eight NVMe SSD slots on a PCIe x16 card Silent operation Add your own ultra-fast SSDs for Mac, Windows, and Linux  Should I Buy a Gen 4 SSD for My Gen 3 Laptop? Nikos Rentas•22K What are PCIe x1 Slots

single slot toaster slot, , and NVMe drives work on high-end parallel data NVMe Drives can use 4 PCIe lanes, which means a theoretical maximum 2 slot as it will fit, but if the slot is SATA only, your throughput speed will be limited A SATA III has a max throughput of 600MBs while an NVMe Gen3