Features: 1. Rear SATA3.0 interface: The new upgrade expands the four rear SATA3.0 interfaces, which is more suitable for narrow spaces. 2U can also be better fixed; from the rear wiring, there will be no crossover with the graphics card. 2. 4U, 2U universal: This product is equipped with 4U, 2U double fixed brackets, which are supported by large or small chassis. 3. Larger heat sink: better heat dissipation and more suitable for long hours of work. 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 chance of blocking the graphics card fan is smaller. 6. Four-layer circuit board with isolation layer in the middle for stronger anti-interference ability. 7. Original mode selection: AHCI, IDE, data disk, three modes are free to choose. Specification: Model: SA3004 Bus interface: PCI-E X1 (compatible with X4, X8, X16/graphic interface) Number of interfaces: SATA3.0 interface * 4 System support: for Windows XP/2003/Vista/Win7/Win8/Win10 (32/64 bit) operating system Size: Approx. 120 x 65 x 56mm / 4.7 x 2.6 x 2.2in (As pictures show) Weight: approx. 89g Package list: 1 x Expansion Card 1 x 2U Baffle 2 x Screw . Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.