GIGABYTE X570 Aorus Master (AMD X570) Motherboard Review
X570 Supports Dual PCIe 4.0 M.2 Slots: B550 motherboards can support multiple M.2 SSDs, but only one of those slots will be PCIe 4.0 compatible (with just one ...
B550-A PRO - MSI-US Store
In terms of connectivity, the B550-A PRO features two M.2 slots for high-speed storage solutions alongside six SATA 6.0 Gb/s ports, enabling multiple storage device connections.
MSI MAG B550 TOMAHAWK Gaming Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX, AMD Ryzen 5000 Series processors) : Amazon.sg: Electronics
MSI MAG B550 TOMAHAWK Gaming Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX, AMD Ryzen 5000 Series processors) : Amazon.sg: Electronics