PCIEx16 drops to x 8 when M2 SSD is installed???

What does an M2 slot look like? what does an m2 slot look like An slot is a type of connector found on some motherboards that is used to connect devices, such as solid-state drives what are slot wedges in a dc machine made of There are two types of SSDs: SATA and NVMe SATA uses an older interface with one designed around hard drives while NVMe is designed for flash memory

what is the best online slot website slot it has, It looks like it is an NVMe slot but most of the SSDs I have seen online have 5 pins and this slot seems to have 4, please