Installing A Memory Module - IBM 7944 Installation And User Manual

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Figure 28. Microprocessor 2 air baffle removal

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.
• 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.
• 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
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. gggeRxff-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)
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Microprocessor 2
air baffle
http://www.ibm.com/supportportal/
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Chapter 2 Installing optional devices
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