A system comprising a socket connector for electrically coupling a module board to the system by inserting the module board horizontally over the socket connector prior to vertically lowering the module board on to the socket connector , the socket connector comprising: a vertical alignment feature with a first height to engage with the module board , wherein the vertical alignment feature vertically aligns the module board with the socket connector ; and a horizontal alignment feature with a second height to engage with the module board , ,wherein the second alignment feature horizontally aligns the module board with the the socket connector wherein the first height of the vertical alignment feature is lower than the second height of the horizontal alignment feature , characterized in that , the socket connector includes a number of recessed connection apertures that include a recessed portion and an aperture portion wherein: the aperture portions are for receiving mounting screws for mounting the module board to the socket connector when the module board is an embedded module board , to the socket connector; and the recessed portions are for receiving head portions of coupling screws coupling the module board to a module carrier when the module board is a hot-pluggable module board , wherein the head portions of the coupling screws are below the hot-pluggable module board and receivable in the recessed portions when the hot-pluggable module board is coupled to the socket connector . a vertical alignment feature with a first height to engage with the module board , wherein the vertical alignment feature vertically aligns the module board with the socket connector ; and a horizontal alignment feature with a second height to engage with the module board , ,wherein the second alignment feature horizontally aligns the module board with the the socket connector wherein the first height of the vertical alignment feature is lower than the second height of the horizontal alignment feature , characterized in that , the socket connector includes a number of recessed connection apertures that include a recessed portion and an aperture portion wherein: the aperture portions are for receiving mounting screws for mounting the module board to the socket connector when the module board is an embedded module board , to the socket connector; and the recessed portions are for receiving head portions of coupling screws coupling the module board to a module carrier when the module board is a hot-pluggable module board , wherein the head portions of the coupling screws are below the hot-pluggable module board and receivable in the recessed portions when the hot-pluggable module board is coupled to the socket connector . the aperture portions are for receiving mounting screws for mounting the module board to the socket connector when the module board is an embedded module board , to the socket connector; and the recessed portions are for receiving head portions of coupling screws coupling the module board to a module carrier when the module board is a hot-pluggable module board , wherein the head portions of the coupling screws are below the hot-pluggable module board and receivable in the recessed portions when the hot-pluggable module board is coupled to the socket connector . <EOS>