ExpressCard 34

ASUS Hyper M.2 x16 Gen 4 Card. Unused CPU PCIe lanes can be assigned to storage, allowing you to create a bootable RAID array with up to four M.2 SSDs. The ASUS Hyper M.2 x16 Gen 4 Card uses PCIe 4.0, which doubles the bandwidth per lane compared to PCIe 3.0.