98 Installing System ComponentsInstalling a Memory RiserCAUTION: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. See your ProductInformation Guide for complete information about safety precautions, workinginside the computer, and protecting against electrostatic discharge.1 Ensure power is removed.2 Open the system. See "Removing the Top Cover" on page 60.3 Ensure the memory riser latches are rotated away from the memory riser.4 Align the memory riser connector with the connector on the system board.5 Lower the memory riser until the memory riser latches engage the chassis(in front) and the back fan housing.6 Press down on the memory riser latches to lever the memory riser onto thesystem board.Memory Population Rules• Memory must be populated beginning with Memory Riser_A, slot 1. Thisis DIMM slot A1. Memory Riser_A is at the right side of the system.• To increase memory capacity, additional memory can be added to MemoryRiser_A beginning with slot A2, and followed by slot A3 and then slot A4.• Additional memory can be added by installing identical pairs of DIMMs inthe lowest numbered available slots.• Identically numbered FBDIMM sockets for both memory risers in abranch must be populated with FBDIMMs identical in terms of timing,technology, and size. For example, DIMM A1 and B1 must be identical,and DIMM C1 and D1 must be identical.• FBDIMMs installed in different socket positions (numbers) on a memoryriser do not need to be identical. For example, DIMMs A1 and B1 can bedifferent from DIMMs A2 and B2.• If memory mirroring is not required, FBDIMMs installed in the samesocket positions (numbers) across the two branches do not need to beidentical. For example, DIMMs A1 and B1 can be different from DIMMsC1 and D1.
