SSD Card 1x PCIe 2x SATA

m 2 in pcie slot   Dan m2 slot mainboard

pcie is about 4x faster The add in cards plugged into a X4-X16 pcie slot will have some sort of adapter

Supports PCIe SSDs The adapter supports PCIe x4 NVMe and PCIe-AHCI SSDs including 2242, 2260, 2280, and 22110 drives The expansion slot EZ-Latch Click： heatsinks with screwless design; EZ-Latch Plus：PCIe x16 slot & slots with quick release design; UC BIOS：User-Centred intuitive

flames of egypt slot There are other devices available which can allow up to 4 NVME drives at x4 in an x16 slot  2 slot doesn't guarantee NVMe compatibility was designed to support USB , SATA, and PCIe, and most early slots supported only SATA