Attention: For proper cooling and airflow, replace the air baffle before you turn onthe server. Operating the server with the air baffle removed might damage servercomponents.If you have other devices to install or remove, do so now. Otherwise, go to“Completing the installation” on page 85.Installing a memory moduleThe following notes describe the types of dual inline memory modules (DIMMs) thatthe server supports and other information that you must consider when you installDIMMs (see “System-board optional device connectors” on page 46 for the locationof the DIMM connectors):v The server supports only industry-standard double-data-rate 3 (DDR3), 800,1066, or 1333 MHz, PC3-10600R-999 (single-rank or dual-rank), registered,synchronous dynamic random-access memory (SDRAM) dual inline memorymodules (DIMMs) with error correcting code (ECC). See http://www.ibm.com/servers/eserver/serverproven/compat/us/ for a list of supported memory modulesfor the server.– The specifications of a DDR3 DIMM are on a label on the DIMM, in thefollowing format.ggg eRxff-PC3-wwwwwm-aa-bb-ccwhere:ggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)e is the number of ranks1 = single-rank2 = dual-rank4 = quad-rankff is the device organization (bit width)4 = x4 organization (4 DQ lines per SDRAM)8 = x8 organization16 = x16 organizationwwwww is the DIMM bandwidth, in MBps6400 = 6.40 GBps (PC3-800 SDRAMs, 8-byte primary data bus)8500 = 8.53 GBps (PC3-1066 SDRAMs, 8-byte primary data bus)10600 = 10.66 GBps (PC3-1333 SDRAMs, 8-byte primary data bus)12800 = 12.80 GBps PC3-1600 SDRAMs, 8-byte primary data bus)m is the DIMM typeE = Unbuffered DIMM (UDIMM) with ECC (x72-bit module data bus)R = Registered DIMM (RDIMM)U = Unbuffered DIMM with no ECC (x64-bit primary data bus)aa is the CAS latency, in clocks at maximum operating frequencybb is the JEDEC SPD Revision Encoding and Additions levelcc is the reference design file for the design of the DIMMd is the revision number of the reference design of the DIMM52 IBM System x3550 M2 Types 4198 and 7946: Installation and User’s Guide
