Table 61. Connector descriptions for cabled PSU(continued)
From To
PIB (Power interposer board connector on system board)
System memory
General memory module installation guidelines
To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory.
If your system's memory configuration fails to observe these guidelines, your system might not boot, stop responding during
memory configuration, or operate with reduced memory.
The memory bus may operate at speeds of 4400 MT/s, 4000 MT/s or 3600 MT/s depending on the following factors:
● System profile selected (for example, Performance, Performance Per Watt Optimized (OS), or Custom [can be run at high
speed or lower])
● Maximum supported DIMM speed of the processors
● Maximum supported speed of the DIMMs
● DIMM rank
NOTE: MT/s indicates DIMM speed in Mega-Transfers per second.
The following are the recommended guidelines for installing memory modules:
● All DIMMs must be DDR5.
● If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).
● Populate memory module sockets only if a processor is installed.
○ For single-processor systems, sockets A1 to A4 are available.
○ A minimum of 1 DIMM must be populated for the installed processor.
● In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
Table 62.
Memory population rules
Processor Memory population Memory population information
Single processor A{1}, A{2}, A{3}, A{4} 1, 2, 4 DIMMs are allowed
● Populate all the sockets with white release tabs first.
● Unbalanced or odd memory configurations result in a performance loss, and the system may not identify the memory
modules being installed. Always populate memory channels identically with equal DIMMs for the best performance.
NOTE:
Equal memory modules refer to DIMMs with identical electrical specification and capacity that may be from
different vendors.
Removing a memory module
Prerequisites
1. Follow the safety guidelines listed in the Safety instructions.
2. Follow the procedure listed in Before working inside your system .
3. Remove the air shroud .
WARNING:
The memory modules are hot to touch for some time after the system has been powered off. Allow
the memory modules to cool before handling them.
NOTE: To ensure proper system cooling, memory module blanks must be installed in any memory socket that is not
occupied. Remove the memory module blanks only if you intend to install memory modules in these sockets.
Steps
1. Locate the appropriate memory module socket.
Installing and removing system components
87
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