Features: 1. Rear SATA3.0 interface: The new upgrade expands the rear four SATA3.0 interfaces, which is more suitable for narrow spaces. 2U can also be fixed better; of the rear wiring, there will be no crossover with the graphics card. 2. Universal 4U, 2U: This product is equipped with 4U, 2U dual fixed racks, which are supported by large or small chassis. 3. Larger heat sink: better heat dissipation and more suitable for long working hours. 4. PCI-E Interface: It is easy to install in the PCI-EXPRESS slot of the chassis with a thick gold-plated PCI-E interface. Better contact and easy data transmission can effectively reduce the data loss rate. 5. The tail is designed to be flush: the chances of blocking the graphics card fan are lower. 6. Four-layer circuit board with insulation layer in the middle for stronger anti-interference ability. 7. Original mode selection: AHCI, IDE, data disk, three modes are free to choose. Specifications: Model: SA3004 Bus interface: PCI-E X1 (compatible with X4, / Vista / Win7 / Win8 / Win10 (32/64 bit) Size: approx. 120 * 65 * 56mm / 4.7 * 2.6 * 2.2in (as pictures show) Weight: Approx. 89g Package list: 1 * expansion card 1 * 2U baffle 2 * screws