53Installing Memory Riser BoardsNOTICE: System board memory sockets 3 and 4 can either be empty orcontain CRIMMs. Sockets 3 and 4 cannot contain RIMMs with memory riserboards installed in sockets 1 and 2.1 If any RIMMs occupy memory sockets on the system board, removethose modules.To locate the memory sockets on the system board, see "System BoardComponents."NOTICE: To avoid damage to the memory riser board, press the riser boardstraight down into the socket with equal force applied at each end of the riserboard.2 Install memory riser board B (see the following figure):a Align the slots on the bottom of riser board B with the ridgesinside memory socket 2 on the system board.The memory sockets on the riser board will face away from themicroprocessor(s).b Press riser board B straight down into socket 2 until the securingclips snap into place at the ends of the riser board.3 Install memory riser board A:a Align the edges of riser board A with the retention brackets on riserboard B.b Align the slots on the bottom of riser board A with the ridgesinside memory socket 1 on the system board.The memory sockets on the riser board will face away from themicroprocessor(s).c Press riser board A straight down into socket 1 until the securingclips snap into place at the ends of the riser board.4 Install the memory riser board retention bracket:a Lower the bracket to the chassis so that the two bracket tabs insertinto the chassis slots.b Press the bracket straight down until it is secured in the chassis.