Table 35. Memory channels
Process
or
Channel 0
Channel 1
Channel 2
Channel 3
Process
or 1
Slots A1, A5, and A9
Slots A2, A6, and A10
Slots A3, A7, and A11
Slots A4, A8, and A12
Process
or 2
Slots B1, B5, and B9
Slots B2, B6, and B10
Slots B3, B7, and B11
Slots B4, B8, and B12
The following table shows the memory populations and operating frequencies for the supported
configurations:
Table 36. Memory population
DIMM
Type
DIMMs
Populated/
Channel
Voltage
Operating
Frequency (in MT/s)
Maximum DIMM Rank/
Channel
RDIMM
1
1.2 V
2400, 2133, 1866
Dual rank or single rank
2
2400, 2133, 1866
Dual rank or single rank
3
1866
Dual rank or single rank
LRDIMM
1
1.2 V
2400, 2133, 1866
Quad rank
2
2400, 2133, 1866
Quad rank
3
2133, 1866
Quad rank
General memory module installation guidelines
NOTE: Memory configurations that fail to observe these guidelines can prevent your system from
booting, stop responding during memory configuration, or operating with reduced memory.
The system supports Flexible Memory Configuration, enabling the system to be configured and run in any
valid chipset architectural configuration. The following are the recommended guidelines for installing
memory modules:
• RDIMMs and LRDIMMs must not be mixed.
• x4 and x8 DRAM based memory modules can be mixed. For more information, see the Mode-specific
guidelines section.
• Up to three dual- or single-rank RDIMMs can be populated per channel.
• Up to three LRDIMMs can be populated per channel regardless of rank count.
• If memory modules with different speeds are installed, they will operate at the speed of the slowest
installed memory module(s) or slower depending on system DIMM configuration.
• Populate memory module sockets only if a processor is installed. For single-processor systems,
sockets A1 to A12 are available. For dual-processor systems, sockets A1 to A12 and sockets B1 to B12
are available.
• Populate all the sockets with white release tabs first, followed by the black release tabs, and then the
green release tabs.
• When mixing memory modules with different capacities, populate the sockets with memory modules
with highest capacity first. For example, if you want to mix 4 GB and 8 GB memory modules, populate
8 GB memory modules in the sockets with white release tabs and 4 GB memory modules in the
sockets with black release tabs.
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