Features: Effectively solving the problem of insufficient pci-e relations on the motherboard, an interface can be expanded to 4. The main control board adopts pci-e interface direct power supply mode, and does not require an external power cable. The main control power supply is unaffected by external interference and has greater stability. By reducing the number of adapters and jumpers, a wire is connected directly to the interface, effectively reducing interface interference and line loss, ensuring data reliability and improving work efficiency. The usb connector is gold plated to reduce interference between interfaces and improve data integrity. Added bios, better compatibility with motherboards and graphics cards, and lower power consumption. Specifications: Material: P C B Number of interfaces: PCI-E x1, USB 3.0*4 Board Size: approx.12x7.5x5.5cm/4.72x2.95x2.16in Supported operating system: for windows, for mac, for linux Bus interface: PCI-E x1 (for x4, x8, x16 graphical interface) Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x PCI-E Riser Board