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 installingDIMMs (see “System-board option connectors” on page 30 for the location of theDIMM connectors):Attention: Do not mix UDIMMs and RDIMMs in the same server.v The server supports industry-standard, 800, 1066, or 1333 MHz,PC3-10600R-999 (single-rank or dual-rank) double-data-rate 3 (DDR3),registered, synchronous dynamic random-access memory (SDRAM) dual inlinememory modules (DIMMs) with error correcting code (ECC). For a list ofsupported options for the server, see http://www.ibm.com/servers/eserver/serverproven/compat/us/; then, select your country and navigate to the list ofoptions for 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 DIMMv The server supports a maximum of 12 single-rank or dual-rank DIMMs.Note: To determine the type of a DIMM, see the label on the DIMM. Theinformation on the label is in the format xxxxx nRxxx PC3-xxxxx-xx-xx-xxx. Thenumeral in the sixth numerical position indicates whether the DIMM is single-rank(n=1) or dual-rank (n=2).46 System x3400 M2 Types 7836 and 7837: Installation and User’s Guide
