60
channel 2: memory sockets B3, B7, and B11
channel 3: memory sockets B4, B8, and B12
General memory module installation guidelines
Your 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 best performance:
• LRDIMMs, and RDIMMsmustnotbemixed.
• x4 and x8 DRAM based DIMMs can be mixed. For more information, see the Mode-specific guidelines section.
• A maximum of three single- or dual-rank RDIMMs can be populated ina channel.
• Populate DIMM 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 sockets with white release tabs first, black, and thengreen.
• Populate the sockets by highest capacity DIMM in the following order - first in sockets with white release levers and then black.
For example, if you want to mix 16 GB and 8 GB DIMMs, populate 16 GB DIMMs in the sockets with white release tabs and 8 GB
DIMMs in the sockets with black release tabs.
• In a dual-processor configuration, the memory configuration for each processor must be identical. For example, if you populate
socket A1for processor 1, then populate socket B1 for processor 2, andso on.
• Memory modules of different sizes can bemixedprovided that other memory population rules are followed (for example, 4 GB
and8GBmemorymodulescanbemixed).
• Depending on mode-specific guidelines, populate four DIMMsper processor (one DIMM per channel) at atime to maximize
performance. For more information, see the Mode-specific guidelines section.
Table 22. Heat sink — processor
configurations
Processor
Configuration
Processor Type (in Watts) Heat
Sink
Width
Number of DIMMs
Maximum System Capacity Reliability, Availability, and
Serviceability (RAS) Features
Single processor
105 W, 120 W or 135 W
68 mm 12
12
Single processor
135 W (four cores, six
cores, or eight cores) or 145
W
86 mm 10 (Three DIMMs in channel
0 and channel 2 and two
DIMMs in channel 1 and
channel 3)
8 (Two DIMMs per channel)
NOTE: When using an 86 mm wide heat sink for a single processor, the memory module sockets A10 and A12 are not
available for population.
Dual processor
105 W, 120 W or 135 W
68 mm 24
24
Dual processor
135 W (four cores, six
cores, or eight cores) or 145
W
86 mm 20 (Three DIMMs in channel
0 and channel 2 and two
DIMMs in channel 1 and
channel 3)
16 (Two DIMMs per channel)
Related links
Mode-specific guidelines
Mode-specific
guidelines
Four memory channels are allocated to each processor. The allowable configurations depend on the memory mode selected.
Advanced Error Correction Code (lockstep)
Advanced Error Correction Code (ECC) mode extends SDDC from x4 DRAM based DIMMs to both x4 and x8 DRAMs. This protects
against single DRAM chip failures during normal operation.
The installation guidelines for memory modules are as follows:
