This Delock riser card allows you to mount your PCI Express x16 card to the PCI Express slot of your motherboard in an 90 angle. This type of horizontal installation is necessary inside 48.3 cm (19 inch) rack mount cases with two height units, where a vertical installation is not possible due to space limitation. The card has a notch that allows the mounting of an additional riser card with a flexible cable (e.g. item 41752 Riser card PCI Express x1 with flexible cable 7 cm).OW