Points to note before purchasing. [Note]: Please be sure to confirm whether your motherboard supports the PCIe split function(Bifurcation Motherboard) before buying this adapter card from us! If you do not support the PCIE split function will not be able to use this product properly. [Note before purchase]: 1.The motherboard must support PCIe split function(Bifurcation Motherboard) , able to set PCIe X4X4X4x4 or 4X4 mode; different motherboards PCIe split channel number is different, some motherboards PCIe RAID is X8 + X4 + X4, this motherboard 4-bit M.2 card can only support 3 M.2 SSD or device, 2-bit M.2 card can only support 1 M.2 SSD or device, if you need to use this product properly, please select the correct motherboard. 2.To create a RAID array, please use M.2 hard disks of the same model and capacity. 3.Many motherboards are sharing PCIe lanes, make sure the motherboard can support the function of PCIe split(Bifurcation Motherboard), but can not identify so many M.2 SSDs or devices, please remove other PCIe devices or replace the slot, such as graphics cards, expansion cards, onboard NVME SSDs, etc. . 4.Some motherboard only the first PCIe x16 slot support the PCIe split(Bifurcation), if occupied then there is no place to insert the graphics card, please be sure to consider clearly before purchase it. 5.Some motherboards PCIe slot is bandwidth sharing, such as the first PCIe slot is PCIe x16, the second PCIe slot is PCIe x8, if the two PCIe slots are inserted device at the same time, all the two PCIe slot is running at PCIe x8 bandwidth, then not all M.2 hard drives can be identified. Also some motherboard PCIe slot and U.2 is only one of two choices, please pay attention to read the motherboard manual. 5. CPU support is required, the CPU should have enough PCIe channels, generally low-end CPUs do not have enough PCIe channels so they may not be able to support, when shopping for a CPU you can refer to the motherboard introduction to make the right c