Most modern motherboards come with M.2 slots built in but if you want more what can you do? PCIe to M.2 adapter of course!
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Overview of M.2 SSDs
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x4 PCI Express to M.2 PCIe SSD Adapter - Drive Adapters and Drive Converters, Hard Drive Accessories
How to install an M.2 SSD
Check PCIe M.2 NVMe SSDs compatibility with your motherboard