High frequency impedance PCB board design. High-precision machine-welded 4-layer PCB gold plating,good transmission stability,good electrical conductivity,and good electrical performance. Plug and play. that the signal is stable at full speed without attenuation. Easy to install,PCI-E 4X extender does not need jumper setting. No driver software program required. PCI-Express 4X Riser Card 90 Degree Adapter Card Best for graphic design,gaming or watching videos. No dropped frames at all. PCI-Express 4X Riser Card does not support hot swap. Freely install PCI-E devices according to the location and size of your 1U/2U server. After connecting the graphics card,the signal transmission is more stable. Made of high-quality materials,suitable for high frequency and low attenuation. Easy to install in 1U/2U chassis at any angle,convenient and fast. Perfect for small computers and server cases. Due to the small size of the chassis and limited space for use,when we need an external PCI-E 4X riser card,it is not high enough to directly insert the motherboard. In this case,use this riser card,which greatly improves our understanding of space. Colour: black + green Material: PCB Package Contents: 1 * PCI-Express 4X Riser Card Only 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.