Compatible with M. 2 PCI-e NVMe SSDs in all sizes: 80x22mm, 60x22mm and 42x22mm, 30x22mm; Not support any M. 2 (SATA-Based B+M Key) SSD;
Motherboard Compatibility: Most Server and X299, X399 can support PCIe x16 Bifurcation
Please note: RIITOP 4x NVMe PCIe Adapter does not Support Hardware Raid, only supports the formation of soft raid in Win10, or you may build raid via Third-party Software, and 4 SSDs should be same model 2. The motherboard need support "PCIEX16 Bifurcation", Otherwise, only one M. 2 SSD can be recognized. Please check Motherboard's user manual on its official website if you are not sure the Mobo can support