Features: Effectively solve the problem that the motherboard PCI-E interface is not enough, an interface can be extended out of 4. The main control board adopts the PCI-E interface direct power supply mode, no external power line is needed, so that the main control power is not affected by external interference, and the stability is higher. Reducing the number of adapters and patch cords, one wire directly to the interface, effectively reduce interface interference and wire loss, ensure data reliability, and improve work efficiency. The USB connector is gold-plated, which reduces the interference between interfaces and enhances the integrity of the data. It increases the LED flashing when the six LEDs are turned on. Added enhanced compatibility with motherboards and graphics cards, reduced power consumption. Specifications: Material: Metal Colour: Gold Black Chip: ASM1184E Size: approx. 12x5.5x7.5cm/4.72x2.17x2.95in Support System: for all for WINDOWS systems, LINUX for Mac Bus Interface: PCI-E X1 (for X4 X8 X16/graphics card interface) Number of interfaces: PCI-E USB interface x 4 Note: 1. Because for Windows restricts the number of graphics cards, only 8 graphics cards can be recognized under for Windows 10, and only 6 graphics cards can be recognized under for Windows 7, and a modified graphics card driver must be used. Try to use the same type of graphics card on a motherboard. 2. LINUX system is required for more than 8 graphics cards. Package includes: 1 x PCI-E 1 to 4 riser card