2 pcs PCI-E Adapter Card:1 pcs Black Gold & 1 pcs Black1 Effectively solve the insufficient PCI-E interface of the motherboard, and one interface can be expanded to 42 Adopting a plug-in design, it is directly connected to the motherboard interface without an extension cable, and it can be fixed to the chassis, greatly improving the stability and reliability3 The main control board adopts the PCI-E interface direct power supply mode, no external power cord is required, so that the main control board power is not interfered by the outside and has higher stability4 Reduce the number of adapters and adapter cables One wire goes directly to the interface, effectively reducing interface interference and wire loss, ensuring data reliability, and improving work efficiency 5 The USB connector is gold-plated, which reduces interference between interfaces and enhances data integrityProduct name: PCI-E 1 to 4 riser cardModel: PCE4USB-A01Bus interface: PCI-EX1 (compatible with X4, X8, X16/graphics interface)Number of interfaces: PCIE USB*4Data transmission speed: 5000 (MB/s)Support system: compatible with all WINDOWS systems, LINUX size:120 x 55 x 75mmMaterial:PCB+metalcolour:Black+goldPackage Contents:2 x PCIE expansion cardOnly the above package content, other products are not included Note: Light and different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is +/- 1-3cm