US Patent 8089779 Data processing system

A data processing system with at least one mainboard is arranged in a computer housing and at least one daughter card that can be electrically connected to the mainboard by at least one riser card. A metal carrier sheet accommodates and supports the riser card and the daughter card and can be arranged together with the riser card and the daughter card in the computer housing. A metal carrier sheet includes a retaining bracket constructed to fix the riser card on the metal carrier sheet without screws. The metal carrier sheet further includes at least one angle bracket and at least one retaining bolt constructed to fix the daughter card without screws on the metal carrier sheet.