IBM System x3550 M3, Installation And User Manual

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Attention: For proper cooling and airflow, replace the air baffle before you turn on
the server. Operating the server with the air baffle removed might damage server
components.
If you have other devices to install or remove, do so now. Otherwise, go to
“Completing the installation” on page 103.
Installing a memory module
The following notes describe the types of DIMMs that the server supports and other
information that you must consider when you install DIMMs.
v To confirm that the server supports the adapter that you are installing, see
http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.
v
When you install or remove DIMMs, the server configuration information
changes. When you restart the server, the system displays a message that
indicates that the memory configuration has changed.
v
The server supports only industry-standard double-data-rate 3 (DDR3), 800,
1066, or 1333 MHz, PC3-10600R-999, registered or unbuffered, synchronous
dynamic random-access memory (SDRAM) dual inline memory modules (DIMMs)
with error correcting code (ECC). See http://www.ibm.com/servers/eserver/
serverproven/compat/us/ for a list of supported memory modules for the server.
– The specifications of a DDR3 DIMM are on a label on the DIMM, in the
following format.
ggg e Rx ff -PC3- wwwwwm - aa - bb - cc
where:
ggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)
e is the number of ranks
1 = single-rank
2 = dual-rank
4 = quad-rank
ff is the device organization (bit width)
4 = x4 organization (4 DQ lines per SDRAM)
8 = x8 organization
16 = x16 organization
wwwww is the DIMM bandwidth, in MBps
6400 = 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 type
E = 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 frequency
bb is the JEDEC SPD Revision Encoding and Additions level
cc is the reference design file for the design of the DIMM
d is the revision number of the reference design of the DIMM
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IBM System x3550 M3 Types 4254 and 7944: Installation and User’s Guide