Owners Manual

channel 3: slots A4, A8, and A12
Processor 2 channel 0: slots B1, B5, and B9
channel 1: slots B2, B6, and B10
channel 2: slots B3, B7, and B11
channel 3: slots B4, B8, and B12
Table 5. Memory population
DIMM Type DIMMs Populated/
Channel
Operating Frequency (in MT/s) Maximum DIMM Rank/Channel
1.2 V
RDIMM 1 2133, 1866, 1600, 1333 Dual rank or single rank
2 2133, 1866, 1600, 1333 Dual rank or single rank
3 1866, 1600, 1333 Dual rank or single rank
LRDIMM 1 2133, 1866, 1600, 1333 Quad rank
2 2133, 1866, 1600, 1333 Quad rank
3 1866, 1600, 1333 Quad rank
General memory module installation guidelines
This 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 DIMMs can be mixed.
• 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.
• 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, then black, and then green.
• Populate the sockets by highest rank count in the following order — first in sockets with white release levers, then black, and then
green. For example, if you want to mix single-rank and dual-rank DIMMs, populate dual-rank DIMMs in the sockets with white release
tabs and single-rank DIMMs in the sockets with black 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 DIMMs, populate 8 GB DIMMs in the sockets with white release tabs and 4 GB DIMMs in
the sockets with black release tabs.
• In a dual-processor configuration, the memory configuration for each processor should be identical. For example, if you populate
socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
• Memory modules of different capacities can be mixed provided other memory population rules are followed (for example, 4 GB and 8
GB memory modules can be mixed).
• Mixing of more than two DIMM capacities in a system is not supported.
• Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.
Sample memory configurations
The following tables show sample memory configurations for one and two processor configurations that follow the appropriate memory
guidelines.
NOTE:
1R, 2R, and 4R in the following tables indicate single, dual, and quad-rank DIMMs respectively.
Table 6. Memory configurations—single processor
System capacity
(in GB)
DIMM size (in
GB)
Number of
DIMMs
DIMM rank, organization,
and frequency
DIMM slot population
4 4 1
1R, x8, 2133 MT/s, A1
Installing and removing system components 21