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1U/2U Riser Card

Riser cards are often used to allow adding expansion cards to a system enclosed in a low-profile case where the height of the case doesn't allow for a perpendicular placement of the full-height expansion card. In 1U and 2U Rackmount computer systems, riser cards are integrated into the system to allow the addition of feature cards in a horizontal position (instead of a standard vertical position). This is due to the height limitations of a 1U and 2U system which are 1.75" and 3.5" respectively. Typically, a 1U system uses a 1U single slot riser card whereas a 2U system uses a 2U 3 slot riser card.