IBM 7380E1U, Installation And User Manual

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Installing a memory module
Attention: Do not mix UDIMMs and RDIMMs in the same server.
The following notes describe the types of dual inline memory modules (DIMMs) that
your server supports and other information that you must consider when you install
DIMMs.
v The server supports industry-standard double-data-rate 3 (DDR3), 800, 1066, or
1333 MHz, PC3-10600R-999 (single-, dual-, or quad-rank), registered,
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.
v
At least one DIMM must be installed for the server to operate, but three DIMMs
per microprocessor improves server performance.
v When two microprocessors are installed in the server, distribute the DIMMs
between the two microprocessors to improve server performance.
v
The server supports a maximum of 16 single-, dual-, or quad-rank DIMMs. The
maximum number of quad-rank DIMMs the server supports is 12.
v
The maximum number of single-, dual-rank, ECC supported UDIMM the server
supports is 12.
v The memory controller has three registered DIMM channels per microprocessor
(channels 0, 1, and 2). Channels 0 and 1 support three DIMMS, and channel 2
supports two DIMMs.
v
Install DIMMs starting with the connector farthest from the microprocessor within
each channel.
v When you install a quad-ranked DIMM in a channel with single- or dual-ranked
DIMMs, install the quad-ranked DIMM in the connector farthest from the
microprocessor.
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IBM System x3500 M3 Type 7380: Installation and User’s Guide