PCI-Express 1x Left Slot Riser Card. This PCI Express Riser Card helps save valuable space within a mini or micro form factor computer case (1u or 2u chassis supported), as well as low profile rack mountable servers. By allowing full-sized PCI Express cards to be installed on a right angle (Parallel with motherboard), situating them parallel to the motherboard. This ensures the height of the PCI Express card is suitable for small form factor cases.