Do B450 Motherboads support PCI-E ?

Helpful Tip: Keep in mind that an SSD is only compatible with a motherboard that supports a slot PCIe 2280 NVMe form factor; 250GB

is a slot that can interface with SATA , PCI Express

m2 vs nvme slot Gen 4 PCIe Slot RAID 0 Performance Install the 8x4 Silent Gen4 PCIe card with your SSDs into your computer's x16 PCIe slot to achieve superior storage

m2 expansion slot 1x is 250 MBs, 1x is 500 MBs, 1x is 985 MBs, 1x is GBs, etc This is faster than the SATA interface for old