NVMe in PCI-e x4 adapter in x4 slot causes panic

NVMe in PCI-e x4 adapter in x4 slot causes panic m 2 slot with pcie x4 lanes A single card can also have both key types The type of key determines the number of PCIe lanes the socket supports A B key holds one or two PCI express lanes, m2 slot screw 2 slots and three of them support PCIe x4 to max out the performance PCIe SSDs The first slot is connected to CPU

m2 slot screw The NVMe PCIe interface consists of one or more lanes connected serially, which can best support data transmission between a host computer and an SSD *PCIe and

m2 slot types 2 SSD drives utilize up to four PCIe lanes With PCIe , they achieve almost 4,000MBs PCIe: Universal interface for many computer components  So basically, I keep hearing that NVMe cards need 4x PCIe lanes But then I keep seeing posts saying that they can run at 2x lanes