Hardware options installation 44
9.
Install the DIMM baffle onto the fan.
10. Install the large redundant fan air baffle, if removed.
11. Install the access panel (on page 27).
12. Do one of the following:
o Close or install the tower bezel, as needed.
o Slide the server back into the rack.
13. Power up the server (on page 24).
Memory options
IMPORTANT: This server does not support mixing RDIMMs and UDIMMs. Attempting to mix
these two types causes the server to halt during BIOS initialization.
The memory subsystem in this server can support RDIMMs or UDIMMs. Both types are referred to as DIMMs
when the information applies to both types. When specified as RDIMM or UDIMM, the information applies
to that type only. All memory installed in the server must be the same type.
The server supports the following DIMM speeds:
• Single- and dual-rank PC3-10600 (DDR-1333) DIMMs operating at 1333 and 1066 MHz
• Quad-rank PC3-8500 (DDR-1067) DIMMs operating at 1066 MHz
Depending on the processor model, the number of DIMMs installed, and whether UDIMMs or RDIMMs are
installed, the memory clock speed may be reduced to 1066 or 800 MHz. For more information on the effect
of DIMM slot population, see "General DIMM slot population guidelines (on page 48)."
Memory subsystem architecture
The memory subsystem in this server is divided into channels. Each processor supports three channels, and
each channel supports three DIMM slots, as shown in the following table.
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