Install a PCI Express x8/x4/x1 card into an x8 PCI Express slot, in a 1U server The PEX8RISER PCI Express (x8) to PCI Express (x8) riser card lets you install x8/x4/x1 PCI Express (PCIe) cards, within a 1U rack mount server chassis - a necessary accessory for almost any 1U chassis that lets you expand capabilities by adding I/O ports or a graphics card. Backed by a StarTech.com 2-year warranty and free lifetime technical support.