Model PH44 quad-slot design, converts one PCIe X16 slot into four independent M. 2 NVMe M Key interfaces for massive storage expansion; Supports standard M. 2 NVMe M Key SSDs in 2230/2242/2260/2280 lengths, compatible with PCIe 3.0 and PCIe 4.0 motherboards; Requires motherboard PCIe bifurcation function enabled in BIOS to recognize all four SSDs simultaneously; otherwise only single drive detected; Standard full-height PCIe bracket, stable PCB circuit layout with reinforced signal lines to avoid high-speed transmission loss; Plug-and-play for Windows and Linux operating systems, ideal for workstations, video editing rigs and small storage servers