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 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/
supportportal/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 eRxff-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)
Microprocessor 2
air baffle
Hole for baffle tab
Baffle tab
Figure 28. Microprocessor 2 air baffle removal
54 IBM System x3550 M3 Type 4254 and 7944: Installation and User's Guide
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