Sun Microsystems Sun Fire X4140, Service Manual

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Chapter 4 Servicing Motherboard Components 4-3
Note – Refer to the Sun Fire X4140, X4240, and X4440 Servers Diagnostics Guide for
more information about DIMM System Event Log (SEL) messages.
FIGURE 4-1
Remind Button
4.1.2 DDR2 DIMM Guidelines
Use the DDR2 DIMM guidelines, and
FIGURE 4-2
to help you plan the memory
configuration of your server.
■
The server has 16 slots on the motherboard, in two groups, that hold
industry-standard DDR2 DIMM memory modules.
■
The Sun Fire X4140 Server supports the following configurations, such as:
■
2 DDR2 DIMMs
■
4 DDR2 DIMMs
■
6 DDR2 DIMMs
■
8 DDR2 DIMMs
■
16 DDR2 DIMMs (fully populated configuration)
Any even number of DIMMs is allowed. The DIMMs must be populated in pairs
and the pairs must be identical in organization, size and speed. See
FIGURE 4-2
for
detailed configuration information.
■
At minimum, Branch 0 must be populated with two DDR2 DIMMS of the same
density (same type), same manufacturing part number.
■
For optimum performance, all DIMMs controlled by a given processor should be
the same capacity and all single-rank or dual-rank. Mixed configurations are
supported, but could result in lower memory performance. Note that all