The PCI-E expansion riser card adapter is designed to convert 1 PCI-E 1X slot into 4 PCI-E 16X slots. The 4 PCI-E 16X slots could connect sound card, graphics card and network card simultaneously and work in an independent non-interfering way. It is the perfect and practical solution to instantly expand PCI-E slots in crowded systems or on the motherboards with limited PCI-E ports. Features: 1-slot PCI-E 1X to 4 slots 16X riser card with high speed USB 3.0 cable. | imultaneously support 4 PCI-E 16X devices, non-interference. Customized for mining BTC. 2 layers PCB board design. Compliant with PCI express 2.0 & 1.1 specification. Solid capacitors supply stable power delivery. Reduced burden on the motherboard by simultaneous power supply from big 4Pin and SATA slots. Easy installation, fully plug and play, convenient and efficient.