BSOD with SSD gen 4 with older motherboard

No, a 16-lane PCIe card will not work at full speed in an 8 lane PCIe slot That's another common question on this topic v3locity July

Kinda odd he spent nearly 4 minutes talking about the difference between Gen 3 and Gen 4

will gen 4 nvme work in gen 3 slot Gen 4 SSDs aren't worth it unless you're working with large files and doing a lot of sequential readwrites

will slot 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