The front and back sides can be expanded with four slots at the same time, which is compatible with 2242/2260/2280/22110 specifications, supports M.2 M-KEY NVME SSD and , and supports M.2 PCle expansion cards and devices. Equipped with full-height chassis bezel and half-height chassis bezel, it can support 2U server small chassis installation. The lies in the addition of double-sided turbofans, which can dissipate heat on both sides, the adjustment of two-speed wind speed, and the first design. LED soft light indicator, when the plug-in disk is powered on, the green light lights up and flashes when reading and writing.PCI-E4.0 0 mode can give you a stable full-speed experience with a reading rate of 14,000 MB/s. It supports four X4 full-channel full-speed NVME SSD and M.2 PCI- E interface devices, and the motherboard supports PCI-E split or PCI -E functions. We use the best materials, using high-end PCB, gold plating technology, good conductivity, strong wear resistance, oxidation resistance and high fire rating. Specifications: Name: double-sided 4-disk NVME PCI-E X16 split card Type: PH44PLUS Hard disk: SSD/M.2 PCI-E device with M.2 NVME protocol Transmission speed: 4 x 32Gbps Packing: cowhide box packing Color: As Shown Material: PC+ metal Package Contents: 2 x motherboard 2 x screwdriver 2 x Half-height chassis bezel 2 x Full height chassis bezel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.