4-10 Upgrading Your System12. Reinstall the top cover on the system chassis. See Top Cover Installationfound earlier in this chapter.13. Plug in the system power cord(s), and turn on the system.14. Run the BIOS Setup to restore the configuration settings to the real-timeclock.15. Reinstall the server into the rack.DIMMsThe system board contains six DIMM sockets (Figure 4-7). Each socket canhold a single 72-bit DIMM module with 128MB, 256MB, 512MB, or 1GB ofmemory. When all six sockets are populated, the system board supports amaximum of 6GB of memory with 1GB DIMMs.Memory is partitioned as three banks of SDRAM that must be populated inpairs, each providing 72 bits of buffered two-way interleaved memory (64-bitmain memory plus ECC). DIMMs will always be installed in sockets 1A and 1B(Figure 4-7). When you install additional DIMMs, you must start with the firstempty socket next to the last DIMMs already installed. When you removeDIMMs, you must start with the highest numbered occupied DIMM sockets onthe system board.1A1B2A3A2B3BNote: DIMMs are always added in pairs in theascending order of DIMM socket numbers.1A DIMM #1-A1B DIMM #1-B DIMM Group Bank #12A DIMM #2-A2B DIMM #2-B DIMM Group Bank #23A DIMM #3-A3B DIMM #3-B DIMM Group Bank #3Figure 4-7. DIMM Locations on the System Board
